What do you think of Peter's actions below?

"Now when Peter had come to Antioch, I withstood him to his face, because he was to be blamed; for before certain men came from James, he would eat with the Gentiles; but when they came, he withdrew and separated himself, fearing those who were of the circumcision. And the rest of the Jews also played the hypocrite with him, so that even Barnabas was carried away with their hypocrisy." Paul, from Gal. 2:11-13

Did the ER leave Peter temporarily? And does that mean that the LR could leave you temporarily as well?

The Holy Spirit left Moses temporarily too on the boarders of the Promised Land. His sin cost him the privilege of entering it. But the Lord forgave him and after death raised him and he has been with the Lord for many years now. The Spirit of God can't abide sin or show favorites. The Lord is equally merciful and equally just to everyone.

And the biblical evidence for what is in the red letters IS .... ?

He sinned. Anyone abiding in Christ cannot sin. It is not possible to sin and retain the spirit of Christ.

Peter was unclear as to relationship between Christians and Gentiles. His understanding grew over time. He eventually got it right. If someone has no idea that what they are doing is sinful they are not held accountable. It is not willful sin. The blood and righteousness of Jesus accommodates sins of ignorance.

So your spouse divorces you every time you do something unpleasant and then remarries you the next day and so forth? WOW, talk about confusion!

If Jesus had sinned even once it would have been all over for the human race. Fortunately for us (and the entire Universe), Jesus succeeded at paying our sin debt of death and making eternal life available, optional for every believing child of God. Post conversion sinning is addressed in 1 John 2:1-2. Through John, Jesus informs us that "if" we sin His propitiation stands ready to restore us to grace and eternal life. Should we refuse to repent, however, we stand uncovered, unforgiven, and damned to eternal death. The only sin He cannot atone for is the sin we refuse to confess and forsake.

Post conversion sinning is a choice. It doesn't happen by accident. We must first consciously, deliberately choose to neglect (or reject) Jesus. While thus disconnected from Jesus we are powerless to obey, powerless to live in harmony with God's will. We are sinning and, consequently, we stand before God condemned, unsaved, worthy of eternal death. We are fully aware of our damnation while we are in this state. The Holy Spirit works wonderfully to convict us of our perilous condition and to motivate us to accept the gift of repentance and to utilize its power to confess our sin. Once penitent, God is free to forgive us and to restore the relationship our sin severed. We resume where we left off abiding in Jesus, growing in grace, maturing in the fruit of the Spirit. We are once again worthy of eternal life.

The idea that we can neglect or reject Jesus during a temptation and retain our saved state while selfishly in the vicious grip of sin, self, and Satan overlooks the Plan of Salvation and the Great Controversy between Jesus and Satan, between good and evil. Is sinning and repenting equivalent to couples getting divorced and remarried every time a spouse is unfaithful? No, of course not. Instead, it is equivalent to one spouse pleading with the other to confess, apologize, and promise to be forever faithful. In some cases, however, spouses choose to abandon the relationship and refuse to return and live faithfully. The marriage is over. The good news is - there are times when such prodigal spouses come home and find favor and forgiveness. Thank you, Jesus.