ANSWER: Perfection and Paradox

I f god is all powerful, why does satan exist?

A: To keep you guessing and stewing in your angst. Eventually you may or may not evolve sufficiently enough to make the grade and figure things out. If you don't you are recycled into space dust. However if you do then you move onto Next.

What happened to all the people on earth 50,000 years ago .

A: they died.

Are they all in hell because jesus wasn't worshiped then and didn't even exist for another 48,000 years?

A: You are in hell when you are clueless. Cluelessness is hell because you are trapped by not recognizing your limitations and are stuck in your failure to seek something bigger. Something that is fairly obvious but asks you TO MAKE SOME EFFORT before revealing Itself and it's Glory.

Mankind is evolving and growing. Perfection exists but so does paradox.