The bible
That it promotes a moral code that is as debased as that of an Afghan warlord
God
If he was more than a fictional character he would be a moral monster
Evolution
Too much to mention. Probably the most fascinating stuff relates to embryonic development - evo devo - and how small changes in DNA can result in significant changes in phenotype.
Satan
He doesn't even appear in the bible until after the Babylonian exile
Jesus
He worshipped and adored the monstrous god of the Old Testament. He was a false prophet and a destroyer of families.
Religions in general
Some are more toxic than others. Some serve a useful social function that secularism struggles to replace.
How did the information you found affect or change your whole belief system?
Radically! I no longer look for patterns in the vicissitudes of life. 'Shit happens'. Find pleasure in all the good things that happen every day. This is the only life we will ever have. We are the lucky ones.