There is no promise God will never let us reject Him and walk away. That WE can forsake Him is something you are not considering as possible. This is the problem. You need to consider our side of the relationship.
Jeremiah was very specific about the nature of the New Covenant to come. Unlike the Old Covenant he prophesied that the Spirit of God would indwell the hearts of believers.
In Jer 31 we read...
“Behold, days are coming,” declares the LORD, “when I will make a new covenant with the house of Israel and with the house of Judah,
Jer 31:32
not like the covenant which I made with their fathers in the day I took them by the hand to bring them out of the land of Egypt, My covenant which they broke, although I was a husband to them,” declares the LORD.
Jer 31:33
“But this is the covenant which I will make with the house of Israel after those days,” declares the LORD, “I will put My law within them and on their heart I will write it; and I will be their God, and they shall be My people.
Jer 31:34
“They will not teach again, each man his neighbor and each man his brother, saying, ‘Know the LORD,’ for they will all know Me, from the least of them to the greatest of them,” declares the LORD, “for I will forgive their iniquity, and their sin I will remember no more.”
And in Jer 32 we read...
“They shall be My people, and I will be their God;
Jer 32:39
and
I will give them one heart and one way, that they may fear Me always, for their own good and for the good of their children after them.
Jer 32:40
“I will make an everlasting covenant with them that I will not turn away from them, to do them good; and I will put the fear of Me in their hearts so that they will not turn away from Me.
We clearly read that He promises to indwell us with the Fear of Him to totally eliminate turning away from Him.
It is interesting that the anointing Jesus moved in that indwelled His believers included the following seven aspects of the Holy Spirit that indwells us.
Isaiah 11
Then a shoot will spring from the stem of Jesse,
And a branch from his roots will bear fruit.
Isa 11:2
The Spirit of the LORD will rest on Him,
The spirit of wisdom and understanding,
The spirit of counsel and strength,
The spirit of knowledge and
the fear of the LORD.
Isa 11:3
Here we have listed the seven spirits that come with the Holy Spirit and also mentioned several times in Revelation.
Among them is the Spirit of the Fear of the Lord that Jeremiah said would prevent us breaking relationship with Him.
He does not want us to worry about losing salvation - it is His work - He has sealed us into His family forever.
Blessings,
Carl Emerson.