That's what I've been saying. Behold's theology actually says it's the sin of rejecting and trampling on the sacrifice of Christ to repent of your sins as a Christian. He can explain why that is so.
You misunderstand. You don't become a Christian unless you repent.
Metanoia. The "after mind", that is, to repudiate the mind of the flesh, and receive Christ, and His mind. That is how you become a Christian. As God gives you faith, and you choose to believe, God gives you rebirth, and you are new, and with a new mind. This is what repentance - metanoia, not what the English word - means.
To think you are repenting again and again shows a misunderstanding of what that means. There is no repentance needed by the reborn, they already have the mind of Christ. If there is sin, all that is needed is that they stop the sin, and that is done by choosing to trust Jesus for whatever it is that is triggering the sin.
I've seen a lot of people who think that when they sin, it's almost like they have to get saved again. Do something to "make it right" with God. "Restore fellowship", things like that. Jesus did everything that was needed, not that only, but everything that Could Be done, on the cross, to remove our sins.
In His death and resurrection we "live unto God". Are you thinking this is an "on-again-off-again" state? We are alive unto God now, whatever else may be true in our lives, it doesn't change that passage.
Much love!