Well before you go on... it is important for you to consider why God is more plausible than the other explanations. Consider the explanation ratio of God (the amount of things explained divided by the amount of things assumed) and compare it to the explanation ration of theories such as evolutionary theory.
What you have suggested is that, because an infinite universe is such a difficult or confusing concept that God is more plausible...
1: this is classic religious attitude, deal with what is not understandable by creating something that is understandable; namely a God in your image which miraculously answers such questions. Hence the inexplicably irrational explanation ratio.
2: have you really done your research? there are many other models such as, oscillatory ones. And granted an infinite universe is a difficult concept to grab, but I think you need to research your understanding of an infinite universe. If the universe is unbounded, and has no beginning or end... why can't we exist?
I think your ignorance in your approach to truth is staggeringly lazy and concerning anything but truth. You two truly are Christians.
P.S the more I read such 'faithful' responses, the more I see the jump to God as an arbitrary choice of self comfort... explain to me that I'm wrong.
Dan.