That's key, to plan to sin in your future is to not be on The Plan of SALVATION.
Maybe
I think you should look into the 3 stages or brackets of belivers.
Baby....infants...new converts
Adolecents...or immature but learning and going after God
Mature... Been in it a while and got the scars to prove it
But the bible says tgere are others also.
Carnal believers.
Read 1 corinthians.
Saved but their works are burned up.
Pauls attitude was " I have turned such a one over to Satan for the destruction of the flesh so that in the end they may be saved"
That defies directly ,a notion of "0sas"