People Made Clean Through Faith - An Incomplete Statement

Today I read 1 Nephi 12 and I was struck by something the angel said.  He tells Nephi that the garments of his people are made white through their faith in Jesus Christ.  It is interesting to me because the purpose of faith is to lead people to action, specifically to repent and be baptized by immersion for the remission of sins and receiving the Gift of the Holy Ghost.  So it is interesting to me that the angel would tell Nephi that his people are made clean through their faith when that is incomplete.  What the angel is implying is that Nephi's people took the other 3 necessary steps in order to be made clean and pure through the Atonement of Jesus Christ.  I had never noticed before how this verse, verse 11, is written this way.  I wonder how many other implications are in the scriptures that I have just glanced over throughout the years?  Until tomorrow.