What religion believes man is god?

The people of ancient Egypt believed that their Pharaoh was one with the gods and therefore he was a god.

The Romans in the time of the Empire believed that the Emperor was a god, which was what got (among other things) the Christians into trouble since they would not worship Him.

Humanists, many of whom, if not all, believe 'man is the measure of all things' and so in effect, man is in the position of god for them - but of course not a god as in a supernatural deity.

The Mormons believe they will become gods, just as almighty God, who they believe was once a man, did. Such is conditional upon their faithfulness.

Most Christians believe Jesus, a man, is God.