There is truth in none of them. All religions are equally false, all of them equally worship a false god, all of them are therefore engaged in devil worship.
Only one thing in the whole universe is true, and that's maths. Is there maths in any religion? No, of course not. All religions flee from maths, reason, and logic. That's how you can tell they are filled with lies. Anything that claims to explain how the universe works and why it came into being without using maths as the backbone of its explanation is full of lies.
Of course this is not an attractive or convenient thought. Maths is hard. Maths is boring. Maths is not human. There are no colourful stories full of sex and violence in maths, no vibrant mythology about love and hate and betrayal and revenge and justice. There is nothing to grab the attention. There is no simplicity to it, so that it can easily spread and have millions of students like how religions have millions of followers. But the truth is not a democracy. It's not the most popular thing. In fact, the truth is the least popular thing most if not all the time. Just because nobody "worships" a "maths god" doesn't mean it isn't the ultimate and absolute truth behind life, the universe, and everything.