prayer for my sisters marriage

My sister is getting a divorce with her husband, from my understanding it is almost completley finalized almost not 100 percent sure. The problem the guy she is married to is an atheist or agnostict and he was doing drugs. I am not sure if God would want her to be with him or not, but if it is the Lords will for them to stay together then so be it, but could you pray for this situation, both of them arenot saved too.

I really can't update you on this situation, haven't heard that much about it, but i did give my sister her old Bible that i was using and some gospel tracts, hopefully she will read them.