And yet in common language we all say that we "need to renew our library books." Obviously this analogy didn't successfully convey to you the intended point. Remind me not to refer to a "sunrise" to make a point
Let me say this again: You presume that "renew" can only mean it no longer exists and must be recreated. I already implicitly stated that I disagreed with that presumption, so let me state it explicitly:
I disagree with that presumption.
The quote I provided was from the Westminster Confession of Faith, which confession includes an entire section on perseverance in faith for the believer. So obviously the quote I provided does not support the notion that such renewal of faith means that faith was lost, void or otherwise invalidated the person's justification in Christ. Now, you may disagree with that (and you obviously do), but I'm not going to argue with you about what the WCF states in this case because it's pretty self-explanatory in this respect.