A question that has occupied my thinking a lot recently is: do I believe in God (and Christianity in general) because I am convinced it is true or does my whole grounding of truth come from a belief in the Christian God; in other words, what comes first: God or truth?
The choice here is basically one of foundationalism vs. religious epistemology (such as that expounded by Alvin Plantiga in 'Warranted Christian Belief'). Here I will provide a evaluation of these two opposing theories, and introduce a third which I hope will successfully answer the dilemma.
Foundationalism on one hand has many advantages: It is an option available for theists and atheists alike, it has a long history, and it seems to conform to most peoples’ intuitions. It is not perfect however, theists might be a little uncomfortable with it because it puts something higher than God (namely reason and evidence), and some might reject it because it ultimately rests on out intuitions; which we have no good reason to trust.
Religious epistemology on the other hand also it's advantages: Many theists might like it because it puts God at the foundation, and it can act as an apoligetic argument for God. Atheists, however, would rather accept any other theory than this as it admits God at the very start. Another objection would be that God should never be used as an abstract answer to a problem as this trivialises the infinite-personal God of the bible.
I propose that both these theories fail because they rely on a 'bottom up' concept of justification like so:

In this model of justification you have to blindly acept either reason and evidence or God. However if a different model of justification is adopted then nothing is blindly acepted:

In this model, the existence of God provides justification for reason and evidence; and reason and evidence provide justification for the existence of God. Most importantly, however, they do so simulaneously; neither one these beliefs is prior to the other. This theory I will term 'Mutual Justification' and is a combination of foundationalism and religous epistemology.