As per Europe and as extended to the Americas it was undeniably the predominant influence for over a 1000yrs.
Many western languages are Latin/Germanic, neither came from Christianity.
Greece and other cultures established important fields in math and science without Christianity. They also contributed to Democracy, which is popular today.
Rome influenced law, government, and culture
The Renaissance was not motivated by Christianity, but rather by looking back at logic and intellectual curiosity from older times before the Church became powerful.
Christianity was the dominant religious influence, but to say it was the dominant cultural influence overall seems to be a really big stretch.
And is primarily responsible for the civil systems we live under today, which are based to a large degree on it's moral teachings.
Consequently, it's influence has formed much of the moral value system of society in general.
Christian dominance in culture and morality probably peaked in the Middle Ages and has dropped off since. At that time, I could go along with what you are saying, although those times were quite different from today. Modern times see a distancing from religion and instead apply logic to government and morality. We're a product of the Renaissance and the Enlightenment really. Throw in the civil rights movements of the mid 20th century as well.
In reality, quite the opposite.
It's only a faulty belief under the moral absolutes of higher moral authority.
On an equal moral footing, slavery as with any other moral decision is subject to the whim of self justification on any given day, individually or collectively.
How? The slave and the slave owner are on equal footing. How can the slave owner justify owning the slave against the slave's will?
If gods were the source of morality, it would be easy. The god just has to "slavery is fine".
Absolute morality is established by God.
Outside of that, morality is a moving target as explained above.
If he is who he says he is and created everything thus, he most assuredly can institute morality standards.
There are no moral absolutes otherwise for the very reason I have been contending.
Absolute morality can't be established, it's absolute. The best God can do is know them from the beginning and repeat them to us, but he can't create morality. If he does it's subjective morality and it doesn't mean anything.
Christians often reference the fact that God is the creator and that allows him to do X, but really that doesn't mean anything. Being the creator makes God the creator, nothing more. It doesn't make him good, a moral authority, your superior, or anything like that.
If God is as he says, he is a paradox, which indicates that he doesn't exist.
Well, is it wrong because God says so or you say so?
Who says it doesn't matter. It's wrong because it's logically wrong. We are all on equal footing (ie our desires are subjective). This leaves theft unjustifiable because the subjective desire to steal an item can't be said to have priority over the owner's desire to retain property.
That remains true even if God said that stealing was morally correct. God would be wrong; moral absolutes.
Subjective or objective is irrelevant.
It's really the only thing worth discussing in this whole topic.
Both of you are mere men so in his eyes, his justification system is as good as yours.
The would be killer's will is as valid as mine, but not his justification (if he actually does kill me). He has no justification.
Precisely. It's about justification, not logic.
Thats why logic may, or may not be a factor.
There is no good or evil without the higher authority of moral absolutes.
It is about logic. Logic is how you justify something.
