How can a rational person believe such nonsense?
Rational people can believe in things that make no sense and are scientifically impossible.
If you use logic someone will say you just need "faith". Faith is the "out" that answers all rational questions.
"Just have faith".
I know highly educated Indian physicians who believe in Hinduism with it's numerous gods with six arms. Totally crazy stuff.
But whatever religion you believe in, that is the "true" religion. The others are false.
Religions were invented to explain the unexplainable.
What is the sun? It's a god driving a chariot across the sky (Helios).
How does the earth stay in place? A god holds it on his shoulders (Atlas).
Why do people fall in love? A being shoots you with a magic arrow.
Why is there so much evil in the world? A woman ate a forbidden fruit and made god mad.
Other mainstream religions have equally nutty beliefs. Christianity believes the father sent his son to die for our sins. Why would he do that? Why would a all-powerful god send his son to be tortured for humans? Makes no sense at all. "So we could be saved." Saved from what? From the all-powerful god? What?

People need a reason to their meaningless lives or they would get depressed. Humans would be even worse than they are. No restrictions on behavior. No limits. No repercussions on evil.
We are specks on a rock spinning through an infinite cosmos. It's hard to even think about that without feeling insignificant and meaningless. It's too much for rational people to accept.
So they grab onto religion to give them a reason for being.
We are in the Milky Way galaxy (just one of innumerable galaxies).

These are many other galaxies in the universe (this is just a very few of them)
