This is why I think that it is perhaps beneficial to not completely remove religion, but replace it with something that is more aligned to the 21st century. Let's be honest, humans are very flawed and prone to succumb to religious thinking; regardless of how smart/dumb you are. Superstitious thinking can arise from simple day to day observation.
So it is much better to fill in the void with something dull like "do good, because mother Gaia watches over you" than to let some random beliefs to fill it. I personally belief that the self-introspection, consciousness-obsessed cultures like Hindu and Buddhism actually have one. Consciousness is the one thing in this world that is actually mysterious. So let's start mysticism from there.
So it is much better to fill in the void with something dull like "do good, because mother Gaia watches over you" than to let some random beliefs to fill it. I personally belief that the self-introspection, consciousness-obsessed cultures like Hindu and Buddhism actually have one. Consciousness is the one thing in this world that is actually mysterious. So let's start mysticism from there.