I really think THIS is the point that may sway some on the "you can lose your salvation" side.
Are you trusting in JESUS to keep you saved, or are you trusting in YOUR ABILITY to trust to keep you saved.
That's what this debate bolls down at it's essence.
If someone actually did trust in themself and their "great faith," then I might agree. But I'm not saying that and I don't know that anyone else has said it. It's just a strawman argument. Even so, the fact remains, no one can know a person's heart. So unless someone tells you directly, hey, by the way, I trust in my own faith more than I trust in the Lord, there's no way you can know it; unless you claim to have some supernatural gift that enables you to read people's minds.