Why does Blake ask the salesmen if they have "Made your decision for Christ"?

During Blake's (Alec Baldwin) motivational speech to the salesmen, he explains the acronym AIDA - Attention, Interest, Decision, Action.

When it comes to 'decision', he asks "Decision. Have you made your decision for Christ?"

A friend believes it is simply a misdelivered line and should have been "Have you made you decision, for Christ's sake?"

I think it was intentionally written that way to reinforce Blake's authority/cockiness by imposing even his religious beliefs on the salesmen.

Any thoughts on this?