To render heathen; to convert to heathenism.(verb)
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Use "heathenize" in a sentence
"What made Daniel steadfast amidst all the efforts to heathenize him during his captivity in Babylon?"
"It is there an act of the Babylonish king to heathenize the child."
"Christian family of its mission as a nursery for the soul; wrest from the parents their high prerogative as stewards of God; and you heathenize home, yea, you brutalize it!"