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>Is there disdain, disgust, heavy in-group vs out-group psychology?
No, we want all souls to be saved. But there is an in and out group per se. Those who are baptized are in. Those who are not are out.
>Does Christian morality extend to non-believers, like thou shalt not kill, etc?
Yes, these are absolutes. It's nothing like the old law which only applied to a certain group of people in a certain time.
>Is slavery permitted on non-Christians?
Christianity never necessarily promoted or forbade slavery, in the Byzantine Empire, Christians could have Christians slaves, and even Jews were allowed to have Christian slaves by inheritance. So, although Christianity doesn't have an official position, it must be noted that Christianity was at the center and one of the main reasons for global abolition of slavery.
>Or is Christianity more open - not permissive - just it is gentler and Christians feel Human concern for unbelievers and want to genuinely help save their souls? Or a mix?
We want all souls to be saved, both Jew and gentile, no matter what.
>How would you say this compares with Islam's outlook on non-believers? Or Jews vs Gentiles, and so on.
Both groups are more inclined to the "disdain, disgust, heavy in-group vs out-group psychology." Although Jews don't believe they're above anyone else. Muslims do though.