I think it is possible for people to have such a poor understanding of salvation that they were never saved in the first place in spite of thinking that they were, but it is a cop out to say that this is the case for every last person who turns away from God without returning. The purpose of the doctrine of eternal security is to give us confidence in our security, but if you add the exception that we are eternally secure unless we happen to be someone who will turn away from God without returning to Him, then that doesn't give us any confidence in our security, and we still need to be careful not to fall away.Could you elaborate on that please.
Certain things must be true of the man or the woman who intends to establish a relationship with holy God. There are changes to be made, changes that we are hopelessly incapable of making ourselves. Our sin has caused us to fall short of God’s standard. Thus in our natural state, we are destined for a godless eternity.
There are many verses that describe the Mosaic Covenant in terms of being a marriage relationship between God and Israel, so the Mosaic Law is His instructions for how to have that relationship, which He said is not too difficult for us to follow (Deuteronomy 30:11-14). The Hebrew word "yada" refers to intimate relational knowledge gained through experience, such as in Genesis 4:1, where Adam knew (yada) Eve, she conceived, and gave birth to Cain. In Exodus 33:13, Moses wanted God to be gracious to him by teaching him to walk in His way that he might know (yada) Him and Israel too. It is possible for someone to end their relationship with God in a similar way that someone can end their relationship with their spouse and the fact that people can become divorced does not mean that they were never married in the first place.