Y is for Yahweh

Yahweh: The name of the God of the Bible practicing Jews and Christians acknowledge and follow. Yahweh is the proper name of God in the Old Testament. There are other names for God such as Jehovah (along with many derivitives) and Elohim and El Shaddai. 
He is called by Father in the New Testament among other names and titles. I trust my life in the God above. 
Other people believe in something else that helps explain the universe and their place in it. There have been many religions...