That sounds a bit managerese. I find myself able not to think in those terms but if your mind is fixed in that idiom, Firstly they will be motivated by hope and that in some sense it is,I think, what theologians call God's primary will. However they will or should be mindful that Jesus didn't give times or dates concerning the day when atheism becomes an untenable, according to scripture.
'Hope' is all very well, Vlad, but it needs to be tempered by a dash of realism: I might hope that one day soon hair will spontaneously reappear on the top of my head, but realism suggests otherwise so that, therefore, to actively hope for that would be pointless.
The same applies to this prayer initiative, which looks like being no more than a pointless gesture even if those involved think they are making a point. Moreover, I suspect they have set themselves for failure, which seems rather naive of them.