If Christianity is not a religion, then what is a religion?

I thought that religion is when you believe in a Deity, and you believe that the Deity needs you to obey it, and has a reward and punishment system. And Christianity fits all that. Plus rituals, like going to church at certain times, praying at certain times, doing certain other things at certain times, reading the Bible.

I believe that Jesus was a Jew who brought reformation to the old religion. Maybe Jesus was not religious and only acted in this way in order to "fit in" and in order to reach his people in a spiritual sense. Or maybe he was religious if he believed in a Deity who would reward or punished him depending on his behavior.

But I do not think that Jesus believed that he was God in the sense that Christians think he is. I think that what he said was misunderstood by the later generations.