Ephesians 2 says, “…by grace you have been saved through faith, and this is not your own doing; it is the gift of God…” Our lives are marked by seeking our own agendas, our own glory, our own power rather than God’s, what we call sin.
Through Jesus Christ, we receive grace, mercy, and forgiveness and we are saved to love God and live with God for eternity at the end of our earthly lives. By believing in Jesus and living in faith, we are saved.
Presbyterians believe you can never lose your salvation. There is nothing you can do to lose God’s love. The same God who gives us the gift of salvation as an act of free grace, will continue to keep us in salvation no matter what.
Now, that doesn’t mean we can just do whatever we want to; it isn’t a license to sin. If we profess our faith, say we’re saved, and then go out and do whatever we want to, our profession of faith and the salvation we claimed through it weren’t real to begin with.