Spencer -- Jesus Saved Al Roker's Life!

Al Roker owes his life to religion -- because Spencer Pratt claims he would have ripped the dude's head off this morning ... if he hadn't recently been "saved by Jesus." Hallelujah!

Heidi & Spencer: Click to watch
The Pratts were leaving Planet Hollywood in NYC this afternoon where they unloaded on the weatherman again -- calling him "disrespectful" and "inappropriate."