Religion is a very fine thing. It's created great art and culture. It's given great purpose and a feeling of taking control of their lives to the human race at times when there was nobody who really knew very much about the Universe. But today things are a little different. We know a great deal more about the Universe and we learn more every day. It's no longer appropriate to accept things blindly simply because that's always been the thing to do. If you believe something passionately but have no evidence to support it, and somebody else believes the opposite and has a huge amount of evidence to support his belief. The rational thing is to change your position on the subject. The irrational (and sometimes dangerous) position is to be immoveable and treat the other person as an enemy.
Anything that is put forward as a fact or a scientific theory must be testable, and if it's found to be wrong or inaccurate it must be discarded.
People should ask themselves if they really 'know' the things they express as facts. If they stop believing something does it stubbornly continue to exist? If it does then it just might be a fact. If it doesn't they'd better start searching for some good solid evidence, or accept that, although they might believe these things themselves, they're not facts and cannot be forced on others without question.