I agree with a couple things you're saying and disagree with a few. Did you really mean "The fact a believer can now recognize sin is a good thing"? I can't disagree more with this. Sin is ALWAYS a bad thing.
I do agree with "Don't focus on "Can I lose my salvation" instead focus on "God thank you for my salvation help me to grow in you"", but think there is a bigger and more important question we should ask. "Was I really saved in the first place?"
I sat in church for years thinking I was saved with people telling me what you're telling him now, "Oh we all sin, even when you're saved you will always sin". While that is true to an extent, it can be VERY misleading. I thought it meant that just because I was still smoking weed, viewing porn, filling my head with all the crap I got from my music, TV, movies, video games, just living EXACTLY like I was before I repeated the magic words after the pastor that I was saved. No that's what my true conversion was like at all when I was REALLY saved. Like Amazing Grace said up there, after I was saved I was an "ALL NEW MAN" like Paul describes, I had new desires and wanted to please God, not on my own, but through the transforming power of the Holy Spirit.
I understand that it is a personal thing and different for each person, also I understand not everyone has as radical a conversion as I did, I had my own "road to Damascus" experience that changed me completely overnight. I just think we need to be a little more careful and clear when dealing with the new converts, we don't want to give them a false sense of security that misleads them, but also don't want to give them unrealistic "rules" they can't live up to and that scare them off. They need to know it's ALL God and His power that changes us, not our own, but make it clear there IS absolutely a change.