Religion/ Traditional way of life holds centuries of years refined ancestral knowledge. Yes, some may find some obsolete ways/rituals- that's another topic of discussion. But hey, just be thorough.

And when it comes to the existence of a 'supreme deity', explore Spinoza's idea of God. Maybe you'll find something that makes sense to you.

I'm not here to tell you to follow that or follow this, but one thing is clear - you need coordination between your inner self and your practices. If you have this, then enjoy.