First I am not going to play what ifs with you.
You need to read what the written Word of God says, and you should come to understand that a spiritual Christian does not sin.
1 Maybe it would help if you could define "spiritual Christian".
2 I am reading a book at the moment, by an American Pastor, who tells us of a time when he heard God ask him to do something and
deliberately ignored him. Is he today a non Christian; outside of God's grace and a quivering wreck because he can do nothing except await his final judgement and eternal punishment? No, he is still an American Pastor with a great ministry and a thriving church.
3 Some people aren't afraid to admit that, at times, they have deliberately disobey God - it's not a case of "what if"; it happens. Yet they are still alive, still believers and are rejoicing in the fact that God forgave them, again.
4 A confession in the CofE prayer book contains the words, "we have sinned, through ignorance, weaklness and our own deliberate fault". That just about covers all areas. Sometimes we don't know that we are sinning; we're ignorant of the fact. Like I hope you don't realise how harsh and unloving some of your posts are. You have been told now, but may have genuinely not realised at the time. And I'm not sitting in judgement because I'm sure my posts are a little tactless at times, or maybe I'm so frustrated by the argument that I post without thinking.
This confession, though, is preceded by the words from 1 John; if we say we have no sin we deceive ourselves and the truth is not in us. If we confess our sins God is fathful and will forgive us."
God can, and does, forgive sin - any sin,
as long as the person is truly sorry and asks for forgiveness.