nothing to do with catholic or any religion, it is merely from past words used for the last 800 years. In fact it is a very common term and was a popular word to use for years, The term was basicly a term for children of a unmarried parents.
But while it was just a way to describe a person, but in our politically correct world, it is not used as often. And is not used that much any longer.
Again it has nothing to do with his religion, merley his perhaps education level in the use of some words.
bastard
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/ˈbęs

tərd/ Pronunciation Key - Show Spelled Pronunciation[
bas-terd] Pronunciation Key - Show IPA Pronunciation –noun 1.a person born of unmarried parents; an illegitimate child. 2.Slang. a.a vicious, despicable, or thoroughly disliked person: Some bastard slashed the tires on my car. b.a person, esp. a man: The poor bastard broke his leg. 3.something irregular, inferior, spurious, or unusual. 4.
bastard culverin. –adjective 5.illegitimate in birth. 6.spurious; not genuine; false: The architecture was bastard Gothic. 7.of abnormal or irregular shape or size; of unusual make or proportions: bastard quartz; bastard mahogany. 8.having the appearance of; resembling in some degree: a bastard Michelangelo; bastard emeralds. 9.Printing. (of a character) not of the font in which it is used or found.
[Origin: 1250–1300; ME < AF
bastard, ML
bastardus (from 11th century), perh. < Gmc (Ingvaeonic)
*bāst-, presumed var. of
*bōst- marriage + OF
-ard -ard, taken as signifying the offspring of a polygynous marriage to a woman of lower status, a pagan tradition not sanctioned by the church; cf. OFris
bost marriage < Gmc
*bandstu-, a n. deriv. of IE
*bhendh- bind; the traditional explanation of OF
bastard as deriv. of
fils de bast “child of a packsaddle” is doubtful on chronological and geographical grounds

]