Reincarnation doesn't make sense

[Basman]

You don't have to believe and subscribe to any one concepts, especially religious ones. People will get mad though if you question the things they believe in. But it is as you say, reincarnation as a religious concept is arbitrary.

Reincarnation might have merit in one way or another, but who knows. I believe personally the concept of "sin" has some merit but differently to how religious people treat the idea. It is not a dogma.