We cannot reject Christianity with our mind alone, nor can we perceive it with our mind alone -according to Christianity. If you are having a crisis of faith my personal advice -which will seem absurd to some on the face of it- would be to be sure not to neglect taking an extra hard look at your life and your heart. If they are not what they should be, you should speak to your priest and seek the sacrament of confession before you take your doubts too seriously. Then by all means do.
Do not forget the subtle effect of sin on the heart; St. Paul reminds us that our intellect can become darkened and damaged through sin. If you deal with your heart, your life, your sin, then and only then is it possible to even suspect -at least from a Christian point of view- that your problem is really purely intellectual, even though existentially the intellect might seem to be the whole show. For this reason I have formed a habit of not taking my doubts too seriously until I have examined and dealt with my life in at least a minimally adequate way according to basic Christian teachings.
"Above all else, guard your heart, for it is the wellspring of life" -Proverbs 4:23
"If anyone is willing to do His will, he will know of the teaching, whether it is of God or whether I speak from Myself." -John 7:17
"Let us love one another that we may confess..." -from The Divine Liturgy
"Blessed are the pure in heart, for they will see God." -Matthew 5:8
“Let them at least learn the nature of the religion they are attacking, before they attack it. If this religion boasted of having a clear vision of God, and of possessing Him plain and unveiled, then to say that nothing we see in the world reveals Him with this degree of clarity would indeed be to attack it. But it says, on the contrary, that man is in darkness and far from God, that He has hidden Himself from man’s knowledge, and that the name He has given Himself in the Scriptures is in fact The Hidden God (Is 45:15). Therefore if it seeks to establish these two facts: that God has in the church erected visible signs by which those who sincerely seek Him may recognize Him, and that he has nevertheless so concealed them that He will only be perceived by those who seek Him with all their hearts, what advantage can the attackers gain when, while admitting that they neglect to seek for the truth, they yet cry that nothing reveals it? For the very darkness in which they lie, and for which they blame the Church, establishes one of her two claims, without invalidating the other, and also, far from destroying her doctrine, confirms it” -Blaise Pascal, Pensees, 335
“To obtain anything from God, the outward must be joined to the inward; that is to say we must kneel and pray alone, etc. so that proud man, who would not submit to God, may now be subject to the body. To expect any help from this outward act is superstition; a refusal to join it to our inward acts is pride. For we must not misunderstand ourselves; we are as much machines as mind. And hence the means by which a man is persuaded are not demonstration alone. How few things are demonstrated! Proofs convince only the mind. It is habit that produces our strongest and most accepted proofs; it guides the machine, which carries the mind with it unconsciously. Who has proved that there will be a morrow and that we will die?” -Blaise Pascal
“Is there a special organ for receiving revelation from God? Yes, though usually we close it and do not let it open up: God’s revelation is given to something called a loving heart.” -Seraphim Rose