Theres loads of forum posts already on the whys and whatnots of this debate, I wish you luck trawling through them! So I'll just give my opinion assuming your Church gig is your main venue and uses a good PA setup.
Go FR - whether thats a Matrix GT1000 (or the new GT1500 3 channel) and passive FR monitors (Matrix, Atomic CLR (TBA), Xitone etc) or just one or two powered FR cabs like the QSCs, RCFs, Xitones etc.
I've already got the Matrix GT1000FX - I share Stratomania's pov - it's nice to have the choice to use normal speaker cabs if you want or experiment with the various passive FR cabs until you find the one that works for you.
Why FR? IMO the cab blocks are very important to get the true character of 'expected' tone from all those amps in the Axe and if your stage monitor is sounding just like what goes to the PA then you'll maybe be more comfortable playing knowing it's what the audience are hearing.
I think the Axe, though versatile enough to work with all backline setups, is at it's most effective used in a FR system - this is the way I'm being drawn I think. (Then again - ask me next tuesday and I could be off on another tangent!)
The only real worry I have is that if I'm playing a small room gig with a ropey vocal only PA I'll need to get the FR monitor up high on a stand and I'll actually be hearing all my tone - I've been so used to stage mic'ed normal cabs or combos with their volumes up but me only hearing them off axis (less highs) over the years that I'll be tempted to dial my presets darker
I haven't sold any of my conventional backline gear and probably won't - more out of nostalgia than probably anything else ... though the official reason if I'm asked will be "it's my backup solution". The only person who will ask will be my wife mind you .... it's my duty to keep her happy isn't it??