I have always maintained that one cannot "lose" their salvation, but that they can cast it away.
The Scriptures say this in many places. We must abide in the Vine.
This is not a hard thing. Jesus requires us to love God and our neighbor.
He will keep us so long as we do not harden our hearts, and refuse to repent when we stumble. Pride is a very dangerous thing.
Read all of Romans 8. Read what Jesus said about the Holy Spirit, who will be with us FOREVER.
Could you show me some of your "so long as..." verses.