That scripture I referenced was this passage...
Hebrews 3:12 See to it, brothers and sisters, that none of you has a sinful, unbelieving heart that turns away from the living God. 13 But encourage one another daily, as long as it is called “Today,” so that none of you may be hardened by sin’s deceitfulness. 14 We have come to share in Christ, if indeed we hold our original conviction firmly to the very end.
You are trying to tell me this is about the unbeliever? Did you not even read it? How can an unbeliever turn away from God when they are already turned away from God? How can unbelievers encourage one another daily? How can an unbeliever hold his or her original conviction firmly to the very end when they have no conviction in the first place? Why would the author (probably Paul) call his readers "brothers and sisters" if they were unbelievers, keeping in mind that he also referred to them as his "holy brothers and sisters, who share in the heavenly calling" earlier?
Hebrews 3:1 Therefore, holy brothers and sisters, who share in the heavenly calling, fix your thoughts on Jesus, whom we acknowledge as our apostle and high priest.
So, no, Hebrews 3:12-14 is not about the unbeliever. Not even close. I'm thinking you didn't even bother reading the passage.
You need to try understanding it in context.
Hebrews 13:5 Keep your lives free from the love of money and be content with what you have, because God has said, “Never will I leave you;
never will I forsake you.”
This only says that God would never leave us or forsake us. It does not say we can never leave or forsake Him. Why would it say "keep your lives free from the love of money" if it wasn't possible for us to get caught up in the love of money, which is the root of all evil (1 Timothy 6:10)? You can't just look at part of the story by cherry picking scripture like this. You need to look at all of scripture and you need to stop taking scripture out of context like you're doing here and like you do with Hebrews 3:12-14.