In terms of pagan influences, doesn't the Coptic Church use the Ancient Egyptians names for the months of the year?? They also use the Kemetic symbol, the ankh, AFAIK.
Last year for my history course, I wrote a paper on the Varangian-Rus (Scandinavians) and their influence on the early history of what is now Ukraine and Russia. I came across an article which was not bad, written about the Conversion of Ukraine in 988. Although I disagreed with the "dumbing-down" of a hagiographical account to the point of being just a sociological response to the events of the time, I do agree with the basic premise. That, all in all, past religions DO have an influence on a culture's acceptance of Christianity.
The Nine Noble Virtues of Asatru: Courage, Truth, Honour, Fidelity, Discipline, Hospitality, Self Reliance, Industriousness, Perseverance. Are any of those anti-Christian?? I don't think so. I think we should all practice those virtues. In this aspect, Asatru is perfectly valid as opposed to Satanism or the like. THAT SAID, believing in more than One God is NOT a belief I would espouse. The Orthodox Church is the Fullness of Truth. But others might have some truth.