So if I'm getting this correctly, the mother and father god stole the bodies of MC's parents, while the MC's mother was pregnant with his sister.
Even if that isn't the case and there's some other shenanigans afoot, it doesn't change the fact that the gods are coming down and stealing people's bodies just to eat other people, erasing their entire existence so no one will even mourn them, and generally be dicks - they should be killed, and then killed again in their own realm thus vanquishing them forever.
I'm also not a big fan of the fact MC is a 'chosen one' who went to another world to forge him into a powerful being... There's something less fun about it, when it's not just happenstance that he went to another world.
The power-scaling has also gotten kinda stupid. He apparently defeated all the evil gods, by going into their real, in the other world - but now he can barely handle an old man on some particularly strong steroids?... lame.