I know this may seem a little strange but I don't think this is something we should joke too much about. My ladyfriend is Wiccan, raised in a Wiccan family and she is a very kind-hearted, caring and loving person.
I'm not joking.
I don't know your friend. I hope she is a kind hearted, caring and loving woman.
That is not the issue.
The issue is the nature of Wicca.
It is a witchcraft. It seeks to enable its adherents to gain powers over themselves and the world through psychological and psychic and magickal techniques. Right there is a problem. It directs the person to seek power and control --often for the best of intentions (healing, etc.)-- by relying on themselves or universal "energy" or spirits. It does not point people to God nor recognizing the sovereignty of God nor recognizing our reliance on God. This is pride, no matter how charitably intended, and pride is the root of all sin. Furthermore, especially by relying on magick and its associated techniques, it clouds the nous and open the mind to the influences of entities who also do not want to recognize the sovereignty of God: the demons. Yes, man does have some residual spiritual abilities from before the Fall of Adam; yes, some of these can be accessed and developed by certain psychological, psychic and magical techniques. But, it is the same lie that seduced Adam: reliance on ourselves and forces that are not God. What Adam had before the Fall was only because he was in a state of union (illumination) with God. By preferring his own will to God's will, he lost that state of union, illumination, and all the extra-normal gifts that were associated with it. The solution is not to replicate the very same mistake that Adam made. The solution is to seek God and union with God and illumination by the uncreated light of God that can only come from living in union with Him, through Jesus Christ. Then, it will be seen, known and experienced that all things are possible in God -- not because of us but because of His will. The whole idea of witchcraft is that we are in control -- that we just have to learn the right techniques to access our powers. The whole idea of Christianity is that God is in control and we are out of control until we submit ourselves entirely to Him through Jesus Christ. A person cannot mix witchcraft and Christianity; they are ultimately diametrically opposed to each other.
Wicca is also paganism. The Wiccans make that expressly clear. And, they make clear that paganism is pretty much anything except the three monotheistic religions. Yes, some forms of paganism have developed an advanced degree of philosophy: Buddhism, Vedanta, Platonism, etc. Yet, ultimately, these philosophies are monism --all is one-- in some form or another. None of these are true monotheism. Some paganism can develop theistic monism (Krishna worship in Hinduism) or personality monism (Mahayana Buddhism), but it all ultimately monism. Monism, ultimately, is the idea that everything is one, great, indefinable Is-ness; and the rest of existence is infinity manifesting in finitude (like the infinite points of a sphere which manifest the sphere). Monism, advanced as it is, is ultimately a form of idolatry -- not because it worships idols made of stone, wood, or metal (which it ultimately does not). Instead, monism is ultimately a form of idolatry because it reaches the end of human reason --reasoning to infinity-- and it stops there, and it calls that God. It is an idol of our own human limitation in the realization of Truth. Now, some monists are humble and recognize that Infinity is just a label for what is absolutely beyond us, and they show That reverence and worship, and that is closer to the Truth. Some monists really are reaching toward God. Yet, here is the issue: God has revealed Himself to mankind. God revealed Himself and named Himself to the prophet Moses and since then. Thus, it is a sin for those who know better to reject this revelation. There are many people who truly do not know God by name, but they recognize Him in the loving kindness and morality of their lives. God bless them. Yet, that is not enough when God reveals Himself and His will for mankind. When God does so to a person, the person has a choice and a duty to respond affirmatively to God. It is like when St. Peter was sent to the house of Cornelius. Cornelius was a pagan, but he was a God-fearing pagan. St. Peter saw this and realized that God truly does love everyone. But, St. Peter did not stop with that. Then, St. Peter taught this Godly pagan about Jesus. A person cannot be pagan and Christian at the same time. Pagans believe in an ultimately impersonal reality that manifests (or is perceived as) finite reality: including gods, goddesses, spirits, us, and so on. Christians believe in an Ultimate Personal Being, GOD, who is one and who is absolutely distinct from the rest of reality, which He created and which He sustains and, in Jesus Christ, which He redeems. Paganism is monism; Christianity is monotheism, and these are diametrically opposed to each other.
Avoid Wicca. It is a made-up religion. Its founder, Gerald Gardner, cobbled together its basic tenets and practices from Western European ceremonial (occult) magick, Malaysian pagan magick (Gardener was a civil servant of the British Empire stationed in Malaysia), British folklore, a smattering of left-handed Tantric Hinduism, and nudism. See "Triumph of the Moon" by British history professor Ronald Hutton (who is not a Wiccan) for a history of its origins and development. Gardner was a liar, and his religion is based on his lies -- no matter how sincerely later Wiccans believe in his religion. Of course, Wicca is (as Hutton correctly observes) protean. Thus, much of Wicca has little directly in common with the Wicca that Gardener invented. Yet, consider what *has* remained constant since Gardner: the pentacle; the "Goddess and the God;" sex magick; causing altered states of consciousness through alcohol, drugs, trance-work; developing psychic powers; calling up and "working with" elemental spirits; following the natural course of seasons as the basis of life and religion; etc. Worst of all, the basis of Wiccan "morals" has been (since Gardner) the "Wiccan Rede": "An it harm ye none, do what thou wilt." Well, that phrase has a double problem. First and most obvious, it is a prescription for doing what people want to do or what feels good so long as it doesn't (seem) to harm others. This is completely opposite of Christian morality, which seeks to do what God wills. Thereby, Christians are supposed to curb their passions by prayer, asceticism and almsgiving. That is the complete opposite of a code which encourages people to do what they want. Wiccan "morality" leads to a sensuality that tries not to offend or hurt others but which is otherwise self-indulgent. Christian morality leads to dispassion, in which people are no longer governed by their passions or senses but live only for what is the will of God. The second problem with Wiccan "morality" is the source of its moral imperative of "do what thou wilt." Its source is not a prophet. It is not Jesus Christ. It is Aleister Crowley who came up with the "do what thou wilt," and Gardner either borrowed or stole the idea. As I am sure you know, Aleister Crowley was the greatest evil wizard of modern times. And so on. Wicca appears to be a benign nature religion which (in contrast to those fussy Christians) seems to celebrate life in a simple and loving and uncomplicated way. But, its founder was a liar and its basic tenets are lies. Nature isn't God; God is God. God isn't some vast, impersonal energy force of cosmic Is-ness; God is GOD: one, personal ultimate Being; and He has revealed Himself through the prophets and in His only Son, Jesus Christ. Human beings cannot "do what thou wilt" so long as it doesn't seem to harm others, because leads to sensuality and selfishness. Human beings must curb and then quell their passions by grace through prayer and asceticism in order to not be ruled by their passions. Magick is not miracles; magick is the corruption of God's power through demons. Miracles are God's powers. The Cross is not the Tree of Odin or the World Tree, from which shaman hang themselves to cause enlightenment; the Cross is the atonement of man and God, by the God-Man, Jesus Christ, and it is the gateway to eternal life because it is the cure to the sickness of selfishness. Etc. Avoid Wicca if you are a Christian because it is in reality the opposite of the Gospel. Otherwise, it will seduce you with its fun and its seeming similarity of emphasis on kindness till you overlook (or, perhaps, celebrate) how very different and opposite from Christianity it is.
Jesus Christ is the basis of Christianity. He is the Way, the Truth and the Life. He is His own proof. Stay focused on Him if you are attracted to Wicca. You cannot be a Christian witch. You can be a Christian or, God have mercy on your soul, you can be a witch. You cannot be a Christian pagan. You can be a Christian or you can be a pagan; you cannot be both.
And if you are attracted to a pagan woman, you are in danger of becoming a pagan yourself.
And an honest pagan will acknowledge most of what I posted here -- at least the part that paganism and Christianity are opposites and they cannot be combined.