Atheists, what is your proof that Christianity is a man-made religion?

That is a large topic that I could write a book on. Just to give you a few things, the first would be the amount of human ignorance found throughout the bible, literally starting from page 1. If I cannot suspect an advanced alien intelligence were involved, how do I get to a godly intelligence? Concerning just the NT, which is the basis of Christianity, the NT writers actually give this away where all of them rely on other sources to basically reverse engineer the character of Jesus based in particular on what the Septuagint (Greek translated OT) said. How the writers wrote is like telling a story where they tell you things about Jesus when he is supposedly alone. Luke comes right out at the beginning to tell you he is not an eyewitness, nor does he know any. Mark also tells you he is telling the tale told to him by Peter if I remember right. Matthew claims to be getting some information from Paul and you can see where he borrows "incorrectly" from the OT as you can with the other writers. For example, Isaiah 7:14 talks about a child named Immanuel that is meant as a "sign" for his King Ahaz where in Isaiah 8 he informs us that "all" of his children are "signs" for his country. Matthew borrows this to wrongly claim that Isaiah was forecasting the future Jesus some 700 years later, even claiming Jesus is known as Immanuel, demonstrating he is borrowing from Isaiah. There are many, many of these kinds of examples demonstrating a reversed engineered Messiah. Even the suffering servant in Isaiah 53 (actually begins at end of 52) is clearly identified as the nation of Israel, with Isaiah himself literally calling the servant "Israel" several times leading up to this passage and even tells us the "suffering" already took place in the past because he was talking about the suffering of Israel at the hands of the Babylonians and why that suffering was necessary. Finally there is the history of Christianity that was not a huge movement but rather a slow, multi-group movement that followed different books concerning the story. It was only when Emperor Constantine used Christianity for political reasons that it stuck like it did. Like I said, I could write a book but another great source to look at are the stories of ex-christians who figured out it was man made for completely different and various reasons, but most make very reasonable cases for their departure and compare the biased delusions as a christian and often wanted to become a better christian and decided to learn more only to discover they have been duped. This sort of leads to looking into ex-preachers/pastors and atheists who once believed until they got their degree in theology to learn the ugly truth about Christianity but were torn with what to do after spending all that time and money to become a pastor/preacher only to do their best for spiritual guidance, while not actually believing in the religion.

Hint: it wasn't made by giraffes.

What do you mean proof? There's the bible for one thing. Although its a work of fiction it was written by men. And it chronicles in mythical terms how Christianity was formed by men like: Jesus, Mathew, Mark, Luke, John, Pilate, Thomas, Lazarus, Judas, and even some women, the two Marys for example.

I have to believe at least part of the bible has a modicum of truth in it. And that truth clearly points to men making up the religion as they go along.

Inconsistency

If God, who is described as a perfect being, created the Bible, that Christians describe as a perfect document, then wouldn't there be one Christianity? Instead, we have a chaos of 1000s of denominations all claiming that their interpretation of the Bible is correct. If God exists, is perfect, is benevolent, and is the author of the Bible then the "truths" of the Bible and of Christianity would be obvious, consistent, and clear to everyone.

Truth, by its very nature, cannot be inconsistent.

Jesus and Paul were men. They made the religion of Christianity.

Christians claim that God is all powerful, all knowing, loving and the creator of the universe.

An all knowing deity would know of a universe where all his aims for the people of the universe would be achieved without any suffering.

An all powerful deity would be able to create such a universe.

A loving deity would want to create such a universe where there is no suffering of his creations.

But in our universe there is suffering, not only of adults, who you might argue have free will to "choose" to suffer, but also of children and babies that do not have the ability to make that choice. In fact we see small children and babies suffering due to "acts of God".

Hence our universe can not have been created by an all powerful, all knowing, loving deity.

Hence God can not exist. Christianity must be man-made.

Please feel free to point out the flaw in my logic.

The history of it. Christian history is a long story of humans making up doctrine as needed for the current needs of the religion. There is absolutely no sign of divine intervention.

The apostles were all men and that Jesus guy born from a woman called Maria was a man... read your myths...the Paul guy was also a man... and curiously all of them were Jewish men

What is your proof that it's NOT?

Are you seriously trying to claim that the Bible was NOT written by mankind?