Yes, Satan believes in God, if that was what you were asking. There is a passage in the Bible in which I believe it says, "Even demons believe in Jesus, and tremble at His name." That passage was meant to show that simply believing in Jesus is not enough to achieve salvation, that actually accepting Him as your Savior is what counts.
If Satan believes in God, then why would Satan wage war against God? Waging war against what one believes to be an omnipotent being is not exactly the smartest thing to do. Satan would have to be pretty stupid to wage war against God, someone he knows he can't beat, and yet the Bible portrays him as a clever trickster.