As far as I have understood it has nothing to do with polytheist. Mushrik is one who follows his/her own wishes or others wishes instead of God's Law.

The person committing "zina" becomes a "mushrik" (follower of one's own wishes or someone else, instead of God's commands) hence he/she should connect with people of their own kind and leave, peaceful and law abiding people, alone.

Cocept of repentence comes from 245

Except for those who come back after this and correct themselves then God is protector and privider.

How do we know that applies to fornicators? From my understanding what you quoted refers to God's forgiveness. I don't think that necessarily applies to a fornicator getting permission to marry a fornicator.

Ive read in many places that a chaste person cannot marry a fornicator, unless they repent. Seems simple enough but i cant seem to understand where people are getting this "unless they repent" clause from. I have noticed in the Quran that God points out that repentance will get your sins forgiven. However for this verse, it does not mention repentance. So does that mean a fornicator cannot marry a non fornicator under any circumstances? I know 245 says "unless they repent", but from my understanding, that verse is referring to 244 talking about false accusers, not fornicators.

Disclaimer I'm fairly new to studying the Quran, so forgive me if i am missing something obvious.

Ive read in many places that a chaste person cannot marry a fornicator, unless they repent. Seems simple enough but i cant seem to understand where people are getting this "unless they repent" clause from. I have noticed in the Quran that God points out that repentance will get your sins forgiven. However for this verse, it does not mention repentance. So does that mean a fornicator cannot marry a non fornicator under any circumstances?
Disclaimer I'm fairly new to studying the Quran, so forgive me if i am missing something obvious.