Only One God

There was a atheist and his son dicussing religion.
The young man later brought up the discussion with his friends, who explained to him the concept on the Father, the Son, and the Holy Spirit.
That day the man went home and told his father that there were three gods and explained to him what his friends had said.
The father stared at his son and said, “No, son, there is only one god, and we don’t believe in him.”