If you're religious and want someone that prays, dont settle for someone that says that they probably will if in the right situation or if they were around others who do, that they would too. In my opinion, take the person as they are right now and dont assume that they will change: will you want to be with them still?
On the other hand, if you don't really mind that they dont pray or something, even if you do, then go for it. Don't let others dictate your feelings/istikaara is always good/ etc. I'm just saying that sometimes what others want for you is not necessarily what you want for yourself. You get me?
Thats all for now.