Keep it simple....
there is no sin that is so sinful Jesus’s forgiveness is not avaiable.
Ephesians 1:7.......In him we have redemption through his blood, the forgiveness of sins, in accordance with ‘the riches of God’s grace’.
1 John 1:9..........If we confess our sins, ‘he is faithful and just and will forgive’ us our sins and purify us from all unrighteousness.
However the ‘consequences’ of sin can vary......which God in His love for us may let our sin play out for a time so that we won’t return to it......Of course the ultimate sin is rejecting Jesus Christ,.and we know what those consequences will mean.
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In my post which you are responding to here, did you read the post I was responding to?
(You really have to read things in context, in order to be able to understand what they mean.)