Religion is our first, our worst, and our stupidest attempt to make sense of the world around us.
Evolution worked on one group of African apes, the hominids, very fast: it enlarged their brains almost instantaneously in evolutionary time.
Overnight, our ancestors woke up with large brains that asked the big questions, yet there were no answers to be found. Hence were invented the gods, spirits, fairies, demons, and other imaginary friends and foes...
The more science advances, the emptier the heavens and hells and spirit worlds become.
God's days are numbered, and the time will come when our descendants will laugh at us for fearing that ridiculous fraud like we laugh at our ancestors for believing the superstitions of their times.