How does it work? if you 're saved, is it for life (and presumably afterlife)?
yes, for eternity
Or, if you sin again, are you then un-saved?
I understand and trust that Biblical salvation starts with trusting in Jesus, and Jesus changes us from how we have been sinning. But then we keep getting more and more character correction > Hebrews 12:4-14, 1 John 4:17. So, we might still sin, but how we sin develops, and what we have for standards gets higher > for only one example >
"Do all things without complaining and disputing, that you may become blameless and harmless, children of God without fault in the midst of a crooked and perverse generation," (in Philippians 2:13-16)
So, while I might not do some of the more obvious sins, still I need to deal with arguing and complaining which also are anti-love and very destructive and abusive examples to children so children can grow up not knowing how to love.
So, like I offer, the standard gets higher. And I take more and more responsibility for being a good example. I am not just free to do what I want while I avoid doing a few no-no's.
I suppose you can repent over and over again, and God will have patience...
Well, yes God loves us unconditionally and He so generously forgives us, but
this is our example required also of us. So, not only must I stop my sinning, but then God expects me also to unconditionally and generously forgive others >
"And walk in love, as Christ also has loved us and given Himself for us, and offering and a sacrifice to God for a sweet-smelling aroma." (Ephesians 5:2)
"forgiving one another, even as God in Christ forgave you" (in Ephesians 4:31-32)
Edied to add: I suppose saved means having Faith in Christ, regardless of your sins, very convenient.
I think you can see, from what I have offered above, it is not convenient
But we are required to stop the more obvious sinning,
and raise the standard and also follow our Father's example of how to love and forgive. And in trusting in Jesus, this comes. Because God loves us, He does not just let us keep on sinning, but He deeply corrects us in our character, as I offer Hebrews 12:4-14 guarantees. And this scripture to me clearly means we need to actively seek God for this real and deep correction. So,
trusting Jesus includes actively seeking Him for real correction.
And therefore, in order to stay clear of this, there are people who treat Christianity like an intellectual issue, and ones give and call much or all attention to doctrinal and theoretical issues. So, part of functioning as a Christian includes how I need to keep attention to how God has me becoming in my character so I can love the way Jesus wants. You might note how in the Sermon on the Mount the first thing Jesus talks about is how to be >
"poor in spirit". And then He talks about . . . how to be >
"merciful",
"meek", and
"pure in heart". This means how Jesus is. This is basic, so we can do what God says, the way He means.
What is convenient is to keep attention elsewhere. But with Jesus and real correction
"you will find rest for your souls." (in Matthew 11:28-30) So, people sinning are not getting away with anything. We are missing out on how we could be loving with God and as family with others in Christ.
Each of us is reaping emotionally and spiritually according to however we have been sowing > Galatians 6:7-8.