Nope, you are right.

Their morality was purely tribal. "Thou shall not kill" was compatible with dashing out the brains of innocent babes because God was THEIR God, and He favored only them.

The really weird bit lies in the fact that early on in the Old Testament; the reality of rival Gods is affirmed. Modern Xtians treat rival Gods as either delusions or Satan in disguise. But in the bitchin' sorcery battle with Pharaoh's wizards ( as seen in Harry Potter IX ) it is a fight between the God of Moses and the Gods of Pharaoh. The lesson of this battle is "our God can beat up your's;" not "our God is real yours are false."

As the imagination of the tribe changed so did their God. But its not considered polite to point out the inconsistencies caused by changing the story throughout time.

Improvements in Xtian morality come from secular society improving and Xtians ( playing catchup ) taking less and less of their scripture seriously.

The same is true for Xtian cosmology. Many presently object to evolution. They no longer object to heliocentrism or the refutation of their "water above, water below" description in the account of Noah ( props for Aronofsky on actually going there in his recent movie. Most focus on the "vault of the heavens" bit ( the rain, ) and ignore the "fountains of the deep" bit ( water shooting up out of the ground. )

This is why He is referred to as the God of the gaps. Everywhere that factual explanations prevail His adherents surrender ( as they did on cosmology. ) In areas where there are gaps in understanding He exists.

Dante