Why can't atheists believe in anything without the 'evidence'?

It depends on what you mean by "spiritual evidence" If by "spiritual evidence" you mean the the feeling I and many other Christians have had of a living God, and the witness of the Holy Spirit to the veracity of Christ as the messiah then ..That is evidence. Personal experience is evidence. It may be subjective, but it is still evidence.

A person who was framed for a crime has personal experience that he did not do the crime. He may have evidence stacked against him that he actually did the crime, but that doesn't negate his personal experience. If you say that other religions have had "spiritual experiences" that doesn't mean that the my own is false.

If you have 10 bottles on a table all saying "water" but only one is really water and the others contain alcohol. Does the falseness of the other bottles negate the true one...No.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.