Its not that I believe that all "grace only" people live in constant sin. Its that this teaching is dangerous, as it can lead people to believe that they can sin as long as they believe. And I believe this because I know people personally in my life that live this way.
I have a friend who steals, manipulates people to get what he wants, lies, cheats and uses drugs/alcohol and talks about very perverted things. And if you try to tell him he needs to leave these things behind and repent and come to Him, he will tell you those same repetitious verses from the bible, "we arent saved by works, salvation comes through faith" ect ect.
And yeah those things are true, but are being taken out of context. Yes salvation comes through faith, but people act as if sinning leading to death contradicts that, therefore sin could never lead to death if you believe. But that is not biblical at all, there are verses about those who believe in vain, believers being given a place with the unbelievers, ect.
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But if you point these verses out to people who stand for "if you believe youll be saved no matter how you live", then theyll just repeat those same old verses out of context, claiming that those other verses cant possibly mean what they clearly state.
The life I came from, those same people use those teachings too. I claimed to be a Christian in my lbgt life, and I still know people in that life who claim to be Christian. If I tell them my testimony, and what the bible says, theyll say "no thats not right, we are saved by faith".
Whether or not anyone will accept it, this teaching can very much lead people to believe its okay to live in rebellion of God, as long as you believe in God.
And for the record, I dont believe that you are saved by works, those whod claim I do only say so to twist my words for the sake of their argument. I believe we are saved by grace, but I believe that the rules are up to God, and not up to us, and I believe in whats in the bible. God will not place anything wicked before Him. And that includes those who believe in what Hes done but continue to refuse His word.