There are verses in which it appears that the expression “the Way” could be considered a valid substitute for “the faith.” And, logically, there’s no reason why the two terms couldn’t be used interchangeably.
Of course, “The Way” is the Bible’s (and especially the book of Acts’) way of describing what we call Christianity. In other words, “The Way” is a label. This post asserts that, to a lesser degree, “The Faith” can also sometimes be considered a label for what we call Christianity.
This is not to say that any reference to “the faith” must be considered at synonymous with “the way.” Not at all. Such conclusions have to be reached on a case by case basis.
Here is an example where it appears that “the faith” could be considered “The Faith” just as “the way” is sometimes considered “The Way.”
Galatians 1:23 – Compare with how Paul spoke of persecuting “the way” in Acts 22:4. That is, you could substitute “the way” for “the faith” in Galatians 1:23 and substitute “the faith” for “the way” in Acts 22:4 and you would not have changed the essential meaning of either verse.
Consider also the following possibilities. They represent the five times in which the expression “the faith” is found in the NASB version of the book of Acts. The translators never capitalize the “f” in “faith” the way they did the “w” in “way” – nor am I suggesting they should have. Nevertheless, the connection should not be ignored. “The faith” had specific and important meaning to the earliest Christians (e.g. Jude 1:3), and the meaning was similar to that found in the expression “the Way.” “The Way” implied a way of life, and that way was certainly a life of faith – for the righteous “live by faith” (Romans 1:17; Galatians 2:20; 3:11; Hebrews 10:38; *** Habakkuk 2:4).