No one truly understands Christianity. Think about it. They have 1000s of denominations because they have 1000s of interpretations of their Holy book because they all have a different idea of what Christianity and its teachings mean. To top it all off most of it is passed down from parents to children where many of those parents are no more qualified to teach religion to their children than they are to teach math or science. Any idiot that has a kid teaches their version of Christianity to their kids no matter how their version compares with anyone else's. Its truly an example of the blind leading the blind.
Also, consider that the Catholic Church provides evident disclosure of it's own contradictionx with the Bible in the volumes of the Catholic Encyclopedia. It offers origins and some confessions of lack of support on the bible.
Roman Catholic Cristianity also has a distrubingly long list of attrocities that many have accused Chrisitianity it's self for commiting. They have been consistently and knowling neglect, opportunistic, immoral and rife with conflict through out thousands of years. They have been a blinding source of darkness not only in relation to bible facts but also to truth as a whole holding back scientific progress not to mention jumping in bed with dictators to ensure the churche's dominance.
Ironic as Hitler would have destroyed the Chruch eventutually.