I'm still on the fence on whether or not it's...
"I know Saint Peter WON'T call my name"
or
"I know Saint Peter WILL call my name"
From what I gather, this is someone who has finally realized he was wrong, and despite his wrong doings - because of his new understanding - WILL be allowed forgiveness, even though he can't explain why. Why would someone who does wrong NOT be able to explain why Saint Peter won't be calling their name? That doesn't make much sense to me. If you do wrong, you most likely know you're doing wrong and would be pretty sure that you're not on "the list." This is someone, who, because of his actions, SHOULDN'T be allowed salvation/forgiveness, but because he's finally realized he was wrong, will be met with grace, even though he doesn't deserve it. It's a song about realizing that humbleness, meekness and subservience (hence the "missionaries" line) are what really matter... not power. It's the realization that matters, hence, I believe it's...
"I know Saint Peter WILL call my name"
But who knows. Love the song either way...