Just look in the mirror and listen to the things you say. God exists, but people believe that he doesn't, and they ignore Satan because they do not want to acknowledge him as their master until it is too late. Moreover, Satan is the perfect lord and master over the atheists because he means separation from God forever and he wants to hide in this world until you die and then he is ready to fark your lame arses forever.
Okay, lot's of problems with this. Only half the population of the world believes in "God". In other words, the God of Abraham and Moses. The other half don't believe in him. Throughout most of history, people believed in other "gods"- Odin, Zeus, Krishna, Amaterasu, Quetzalcoatl.... How can they all be "false" but your God be "real"?
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I "ignore" Satan because he's kind of silly. He barely appears in the bible, and most of our images of Satan have more to do with Dante and Milton than Jesus.
Frankly, the notion is a bit silly, and borrows a lot from mythology.