If you can lose your salvation by sinning, then you keep it by not sinning.
That's keeping it by works.
So you're contradicting yourself. Catholicism teaches salvation by works, gotta be good enough, you can't sin or God's gonna zap you and too bad for you. It time to burn for eternity.
And is NOT being saved. Hell is what we're saved from.
And since God created us as new creatures in Christ through being born again spiritually, and sealed the deal with the Holy Spirit and canceling the record of our sin debt, there is no judgement and our salvation is sure. If there's no sin held to our account, then there's nothing to condemn us for.
bingo