Holy shit, I have a Midi Song similar to this!
Take the piano's ever 3 note repeating raise in the beginning, transfer it to an organ and you have the intro the one of my midi creations (ART 69).
It starts off with that repeating raise for about 30 measures, then switches to a more 'Churchy' feel. But I don't overlap it with another 'raising 3' like you do...I only have slow note transitions in the mist of it.
Great work to your piece, it's holds a single mood throughout the song. Unlike most of my pieces