Taking Every Thought Captive Podcast - Episode 17
What is the relationship between faith and knowledge? Are they opposed to each other? Or is there a vital and necessary relationship between the two? I recently read a book called What is Faith? by J. Gresham Machen that addresses this in the early parts of the book.
According to Machen, there is indeed a very important relationship between the two. We must not think that faith is merely assent to certain facts, but we must understand that certain propositions about God are necessary to faith. The denial of this truth can lead to many errors, including mysticism. In this episode, I discuss more of what Machen has to say about this and some objections that are raised.
Here is a little of Machen in his own words.
Assent to certain propositions is not the whole of faith, but it is an absolutely necessary element of faith. So assent to certain propositions about God is not all of faith in God, but it is necessary to faith in God; and Christian faith, in particular, though it is more than assent to a creed, is absolutely impossible without assent to a creed. One cannot trust a God whom one holds with the mind to be either non-existent or untrustworthy. 
Download this episode here: TETC Episode 17
 Machen, J. Gresham, “What is Faith?”, Edinburgh: The Banner of Truth Trust, 1991, p 48.