Read two books: 1) The Selfish Gene by Richard Dawkins and 2) A Brief History of Time by Stephen Hawkin. Both are excellent and will enlighten you .

if you understand them, it then starts to get really interesting as you start to comprehend the vast interweaving complexity that permeates everything. No need to deflect the question of where do we come from with space-aliens or any other supernatural entity.

The Blind Watch Maker also by Richard Dawkins is another good one.