-There is clear evidence that prayer does not work despite the Bible promising prayers will be answered.
-There is clear evidence that humans invent gods. Humans have invented so many gods that the default assumption should be that a god is a supernatural entity invented by humans. Christianity would need solid evidence that the Jewish god is an exception to this rule but there is no such evidence.
-There is clear evidence that religions and gods are propagated through culture by infecting children, and no evidence that they are propagated by gods.
-There is clear evidence that Christianity has evolved as human understanding of the world has changed whilst a real, God-given religion, should never need to change.
-There is clear evidence that humans on this planet have unequal access to Christianity so, if Christianity were true, billions would be condemned to hell for no fault of their own. This contradicts the Christian notion that God is omnibenevolent.
-There is clear evidence that the Bible, supposedly inspired by God, is liberally sprinkled with the type of errors we would expect from its Iron Age authors but would not expect from the creator of the universe.
-Christian theology is incoherent to the point of absurdity. God killing his son so he can forgive our future sin is like me breaking my son’s legs so I can forgive my neighbor in case she ever parks her car on my drive. It is quite ridiculous.
-There is clear evidence that the arguments presented for the existence of the Jewish God are logically flawed—all of them have been shown to be unreliable. If this were not the case, all honest and intelligent people would accept that God exists, just as all honest and intelligent people accept that black holes exist.
All that is left for Christians is faith and their feelings. We know that faith and feelings can be used to believe in any god at all—including non-existent gods. So faith and feelings cannot help us determine if Christianity is true.
But that is all Christians have.
atheistalliance.org