Is the Buddha God?

Is the Buddha an historic person (did he really exist)? If yes, was he a human being or a God, or both, or a human that became a god or God? Do Buddhists regard him as an emanation of God (for example, as Christians regard Jesus of Nazareth), or a prophet of God (as Muslims regard Mahomet), or an angel? My question is honest and is asked with a friendship intend of peaceful dialogue to lower the tensions between religions, philosophies and esoterisms (rare private philosophies). My goal is to learn better and to show to others how to speak publicly about spirituality lowering the violence; not increasing it and not making money on it. I believe it is very important today to learn those skills.