How can source of everything not be the source of things that supposedly came from it?

i'm trying to logically understand (once again i might add).if god is the source of everything then it surely is the source of all evil also.most believers say that satan is the source of all evil,but that statement is a contradiction because supposedly god is the source of everything.if god is the source of everything then he is also the source of the part in satan which made him rebel against god,the part that some call "firstborn sign of evil",having this in mind it becomes pretty clear that god is the true source of evil.if god is a manifestation of good and evil then most bible verses are nothing but a lies in order to blame someone for it's own "filth"...