I agree with the Don about man having a negative impact on Christianity. If I were a believer in the Christian God, I would recognise that Christianity is inseparable from the church, meaning that Christianity was organised from the onset. If I was a believer in the God of Abraham, Isaac and Jacob and that Jesus Christ was his only begotten in the flesh, I would believe the Bible being a true record of how God told his people to live and worship.
I would recognise that Jesus brought a new model for worship that included an organised church. I would recognise that God used spokes persons or prophet to reveal His will. And there you have it; a hierarchy or organisation with God on top directing his people calling an elected few to do his will and conduct His kingdom on earth. An organisation that reaches into the heavens with angels and other heavenly beings doing the Lord’s will.
At the onset a perfect organisation that could give us intelligence from the most intelligent being in cosmos, the one that created it.
There would be no need for Science, because God could tell us how things are. If we wondered about black holes and travelling through space in a blink of an eye, He could tell us, because he governs those laws.

I would recognise man killing the spokesmen of God. That man corrupted this organisation bringing in the ideas of men; power-hungry and evil men taking advantage of the faith of the pious to gain pleasures of the flesh and the mind. Other men, maybe not evil, using the church to gain a nation. I would recognise that not all men think that following the simple steps outlined by His prophets are enough, that the grace of God might not be sufficient to gain that which is promised in the hereafter. That faith without actions are dead. To show God their worthiness, they must do something more, walk the extra mile. They must atone like their saviour did for any sin they might have committed and thereby putting aside the very core of their religion. They become the extra believer, the faith wavering extr(a)emist. I would recognise that man closed the heavens by murdering the doors and are left stumbling in the dark with a closed canon containing nothing but a story of how it used to be. I would recognise that man tries to figure out the nature of God and his creation using nothing but logic and argument.

But I am not a believer and what should I think of all this?
I know three faiths that puts Abraham as a forefather, have a common culprit called Gabriel. Who is this person that engulfed the world in so much grief and strife? Why promise to the Jews that the Messiah would crush the King that would destroy the holy people and then give glad tidings to the priest of Abia of a son to be borne and then strike him dumb, then give a young maiden the news that she will be the mother of a God, and later spend 23 years with a merchant whispering revelations that the merchant’s companions wrote down.