I have yet to hear anyone really give any kind of explanation of how they can lose their salvation. One sin? Ten sins? A hundred sins? Does it matter which kind of sins?
There's no limit to God's forgiveness so there's no limit to how often you can sin and still be forgiven. I can see only 2 ways to lose it. One is to reject Christ, to turn your back on him and tell him to be gone. The other is committing the unforgivable sin - calling the Holy Spirit evil. I can't see any true Christian doing either, though.
“In a time of deceit telling the truth is a revolutionary act.” ― George Orwell
It's not over when you lose. It's over when you quit.
