Please tell me English isn't your first language....

Well, I am not religious, so I don't believe he is powerful.

But to answer your questions; God can't forgive Satan because Satan didn't ask for forgiveness. Romans 10;9 says That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.

If you want foregiveness, you must ask for it.

And why didn't he prevent Satan from creating the evil in the world?

Well, You know the story of genesis, how Adam and Eve were in the garden of Eden?

While they were in that garden, they didn't really have free will. Because at that point, sin wasn't created, there wasn't anything called sin, and because sin didn't exist, they couldn't do anything bad. Adam and Eve didn't have the freedom to do anything bad or evil, simply because it was nonexistent. Understand? It's complicated, I know.

But God he's not some dictator, he didn't want his children to be forced to do the right thing, God wanted his children to WANT to do the right thing, still following?

That's why he sent Satan to tempt Eve with the forbidden tree, or something, and since she ate a fruit she wasn't supposed to eat, she was the first one to ever commit a sin, and from that point on everyone could choose to do the right or wrong thing.

thank you shout out loud for answering my question.sorry this last part is for my 50 word part i have to wright 50 words in order to send it sorry.