Yes, lately I woundered about the 3 god mentioning as well. They call it in German "Heilige Dreifaltigkeit". Probably you can traslate it into something like "Holy Trinity". They are talking about God as the father, Jesus as the son and some other holy ghost.
So they probably claim all these persons to be one person: God.
I was raised catholic. The way it was taught to me is that god simultaneously is God, Jesus and the Holy Ghost. How? God magic I guess.
This concept was decided hundreds of years after Jesus and Paul and the people of the Bible were around, by the Council of Nicaea (check spelling). There was a huge controversy between the Roman Catholic Church, which taught the Trinity, and the Unitarian Christians, who believed that Jesus was a prophet, led by Arius.
This was the original cause of division between the Western (Roman) Church, and the Eastern (Byzantine) Church. However, the Trinitarians were far more cunning and ruthless, and they ended up suppressing the Unitarian ideas, and forcing Catholicism on the whole bunch.
The Trinity is not taught in the Bible.
