Best guess? When Paul went around spreading the word, that was a part he added in to make Christianity more appealing. The distinct line between asshole-God and cool-God seems to be the line between the Old Testament and the New Testament and Paul didn't mess with any of the OT.
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"If you cling to something as the absolute truth and you are caught in it, when the truth comes in person to knock on your door you will refuse to let it in." ~ Siddhartha Gautama
"If you cling to something as the absolute truth and you are caught in it, when the truth comes in person to knock on your door you will refuse to let it in." ~ Siddhartha Gautama