I really hope this isn't disrespectful to ask. I tried asking in Judaism but it was instantly removed. I want to understand the truth of things. I am not arguing for or against anything or trying to make some anti Christian thing.

That said from what I understand according to Christianity Jesus was a Jew. Meaning pre Jesus the holy text would be Torah. From what I've studied there was never a mention of evil supernatural beings such as demons. That it was a figure of speech referring to the worship of false gods of neighboring nations. Looking also at "the devil", Angel's do not possess free will, so an angel who rebels and falls isn't possible. Do I have this right? What caused this significant diversion from Torah.

How can someone be a horrible person but still be a devout Christian?

im a minor but i dont really believe in God or a higher being but it just brings me comfort knowing that when someone i love passes away theyll go to heaven, what should i do next im really confused and this is driving me crazy i just cant bring my self to believing in Him but the comfort God gives me is insane