1- well they'd say that in gods perspective all prayers are done at once and he listens and answers all at once, not making any sense to ask if he answers first or if people pray first.
2- The second point is very interesting. If the creation is absolutely necessary, and this follows from the allegation that god is out of time, than there is a necessary relation of 1 to 1 between God and the creation. If two objects have such a relation (necessary and exclusive) than they are the same object. Could we than reach the conclusion that god is the creation? Moreover, if god is immutable, than he is not all mighty and vice versa.