Comment: If one professes

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If one professes

a belief theft is wrong and they steal ...

If one professes a belief in the prince of peace and they do not forgive trespasses ...

An often quoted passage of scripture to the effect by their fruits ye shall know them means deeds not words, actions not lips. Many people probably recognize the truth of that simple common sense point without quoting scripture.

When you say people believed Christianity for the better part of 2000 years implying large political majorities ... I don't believe it. I don't see societies or civilizations in the past 2000 years founded or structured on the precepts of love, grace, mercy, or forgiveness. They are structured on redress, retribution, or revenge via law.