Why do people "Believe" in Religion?

I'm not bashing I REALY want to know. When I ask someone all they do is BASH me and tell me I'm going to hell for questioning god, how is that a good faith act? If religion is supposed to be full of kindness and happiness, how come Christians are so crucial against what they don't believe in, if its not in their book, then its not real and your going to hell. That leads to my next question, why do people believe what is written in a book thousands of years ago by people about themselves? How does loving all creatures and people in religion make people change laws and kindness towards others if its not in their book? Someones gay, THEIR GOING TO HELL! Isn't god supposed to love all, then why is he so mean and why would you want to worship such a mean person/thing? ( and no its not about gays, it was just for an example). How can you believe in something if you cant prove it ever happened, or even remotely happened with any proof? How can you believe in an idol that was RESURRECTED... seriously.. RESURRECTED... But if I believe in something just as Magical or Spiritual or Not Possible, it is wrong?