Why does Eugene hates his father does not like his father like his daughter and sister

Ifeoma and Eugene’s father, Papa-Nnukwu, is a traditionalist, holding on to the faith of his ancestors. Kambili grows to love Papa-Nnukuw despite her father’s (Eugene's) warnings that he is a heathen. Eugene is a devout Catholic and thinks his father to be uncivilized and not "godly".