You're still not listening. If the people in question do not take the Bible as the direct word of God and as the literal truth then they are not bound in the way you are saying.
Of course they are bound, it states so in the bible:
Whoever sacrifices to any god, except the Lord alone, shall be doomed. (Exodus 22:19 NAB)
They entered into a covenant to seek the Lord, the God of their fathers, with all their heart and soul; and everyone who would not seek the Lord, the God of Israel, was to be put to death, whether small or great, whether man or woman. (2 Chronicles 15:12-13 NAB)
If a man still prophesies, his parents, father and mother, shall say to him, "You shall not live, because you have spoken a lie in the name of the Lord." When he prophesies, his parents, father and mother, shall thrust him through. (Zechariah 13:3 NAB)
If your own full brother, or your son or daughter, or your beloved wife, or you intimate friend, entices you secretly to serve other gods, whom you and your fathers have not known, gods of any other nations, near at hand or far away, from one end of the earth to the other: do not yield to him or listen to him, nor look with pity upon him, to spare or shield him, but kill him. Your hand shall be the first raised to slay him; the rest of the people shall join in with you. You shall stone him to death, because he sought to lead you astray from the Lord, your God, who brought you out of the land of Egypt, that place of slavery. And all Israel, hearing of this, shall fear and never do such evil as this in your midst. (Deuteronomy 13:7-12 NAB)
You are saying that a Christian must take the Bible literally and in no way can they decide that any portion was unduly influenced by the writers culture or personality or failure to understand.
That is irrelevant. The bible is the word of god, and you are commanded to obey by your god. This is incontrovertible.
You, an atheist, are taking the position that only fundamentalists/literalists are Christians.
You can call them whatever you want, but it is only those who follow the bible to the letter who will be granted salvation and a place beside their god, the rest will fry. This is written in the bible, blasphemer!