Where's the proof that things said in the Bile are true?

For you Christians out there, don't sway the question and make it something it's not. What is this ****? Gay people burn in hell? So this so called "God" only likes a certain group of people? If he really is real, why do I have an open mind and I can doubt him because there's no evidence? This all seems like one big fairytale to me. When people started making scriptures about Jesus in the bible it was decades after he died. What - they forgot about him for 30 years, or what?