Name That Tune

This is Isaac's favorite song right now.

4/17/10 - Stop reading if you don't want to know the answer yet.

only Kat should know by the tune/timing, so i'll go ahead and answer. it's the 1st article of faith (for our church). He omits the first 5 words, then it sounds like "under water" instead of "Eternal Father." He also doesn't say the "s" sound, or the "f" sound. 
Here it is,
"We believe in God, the Eternal Father, and in his son, Jesus Christ, and in the Holy Ghost."