I've been following this a bit and wanting to contribute, but not really around much this week and not sure if what I wanted to say made any sense.
As someone else said, I've personally never heard the idea of God using 'even weak people' or 'women as much as men', or whatever, and the idea that God would discriminate in such a way (that is, using or working through, or whatever only the strong or the male) would never have crossed my mind.
I also like the idea of God 'working through' individuals (which implies working with them - with all their strengths and weaknesses and quirks and individualities) much better than that of God 'using' them... which implies more (to me, though probably not to the people who say it) that we're just puppets in God's hands, rather than having our own free will which we can use to turn to Him (to work with Him). I don't know... I like the idea of God inviting us to work with Him, and giving us the tools with which to do so (which may not be the tools we had imagined... and which may not be those most prized by society -- after all, Jesus was a carpenter from Nazareth, not a prince or a great religious leader in the conventional sense: I always understood this to be the point of the story of the visit of the Magi to Herod, that we can find God in a stable as much as in a palace, or to turn this around to the current discussion, that God works with the humble as much as with the mighty). [Errr... that was quite a sentence - sorry it's so convoluted, but hopefully you can see what I mean.]
The other thing I've been thinking about is about Paul as God's 'chosen vessel'. I like the idea of the 'vessel' because it suggests a receptacle; it suggests that we are (or can be) containers, open to receive God. And this, it seems to me, supports the idea of God working with us, insofar as, if we receive God into ourselves if we let him fill us up as if we were a vessel then we have no option but to work with Him, since He is intrinsically part of us. Am I making any sense? I have just re-read the story of the conversion of Paul, and what struck me there was the sense that when Ananias baptised Paul he enabled him to move from being God's 'chosen vessel' (that is, God had already chosen him and had seen the potential in him) to acting as God's 'chosen vessel'. So no sooner is Paul baptised than his sight is restored and he eats and becomes strong again, and then. after just a few days, he begins preaching 'Jesus is the Son of God'. But he's able to do this because he is filled with the strength that God gives him to enable him to do His work....
So, I guess my conclusion is this... What if we are all potentially chosen vessels? What if we open ourselves to God and let Him fill us with the strength to do what He would have us do, using the very different gifts (we can't all be Pauls, obviously) that He has given us?
That's a huge long waffle, but I've been saving it up for some time. Sorry if it doesn't make any sense.