I was religious from childhood, and have always been interested in religions, mythology and science; I was a devout, practising Catholic; I read the Bible, both Old and New Testaments and the Apocrypha, several times; and was taught about it in school.
After studying and thinking deeply about faith, I realised in mid-teenage that faith was based upon nothing but itself, that science explained nature satisfactorily without needing supernatural beings, and that religious beliefs were no different to those of ancient beliefs in gods and goddesses.
When I first had doubts about my faith I thought that maybe this was a test of it, which was an idea planted in my mind by those teaching us about our faith. So I made the effort to accept it even more so. But the doubts came again, and I wondered what would happen if we took faith out of the equation; the world and nature still made sense, so I saw no reason to get back into it. And my understanding is that there's no theoretical or mathematical need for a god or gods, and there's no valid evidence of it or them; so there's no reason to believe. At the time this was difficult intellectually and emotionally (I was a teenager, after all).
That was over 40 years ago, and my escape from faith has freed me to embrace what science has to offer, which I consider far more plausible than belief in the supernatural, and is the nearest we can get to the truth about how nature and the universe work. I've felt a sense of freedom ever since, and am happy and at peace with this. And I've found the humility to admit that I don't know everything, rather than masking this by invoking a deity.
I still have an interest in religions, mythology, folklore and related matters, and am fascinated that people still believe in things that to me are clearly just not true.