I used to believe in God, and study the Bible, when I was very young. I don't look at it as "lost time" at all. In fact, those were some of the most intellectually productive years of my life. I didn't just read the Bible, I also read Dostoevsky and several other Christian authors, but it was all connected to my faith, and it was all very much productive and worthwhile. I highly recommend crazy ol' Fyodor. Every single thing he ever wrote is genius. Insane (or maybe just insanely pessimistic) on some level, but he cuts to the essence of things on every other level. So does Nietzsche (who is very much Christian, and a fundamentalist at that, in his critique of the Church, though he's nowhere near as sophisticated as Dostoevsky). So does most of the Bible, as do some other religious texts.
There's a lot you can learn from religion, when you're really young. You can even learn some stuff from it when you're old. The main things wrong about the Bible are the (occasional) altruism and the supernatural God part. Most of everything else makes quite a bit of sense, and is well worth studying. When you study the Bible, you're studying thousands upon thousands of years worth of human experience. And even the supernatural God part can just be interpreted as a metaphor for reality, and you're fine (well, it's more complex than that, it involves the context of knowledge people had before science was a thing, but there's no reason to get into that here).
Thing is, this is all off topic. The thread is about the loss of a literal God. There's no loss there, because there's no literal God.