This is permissible, however your son must never stop to call her to islam in a nice and wise way. The marriage must be done according to Islam with the consent of her guardian and the presence of two male Muslims.

My son wants to do nikaah with a Christian Protestant German lady. She does not do idol worship, but, as of now she does not want to revert to Islam. (May Allah grant her hidayah) My question is that is this nikaah permissible? Can we attend this nikaah?

Fiqh of Marriage | March 5, 2017 1:47 am
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I was reading about major sins & I saw that a man who knows his wife commits adultery & does nothing will be punished by Allah. Does it also apply to women who know their husband is doing such acts but do nothing? Also does it mean they have to divorce either way, as in the case of Li’aan? Because people here say the wife must stay with the husband.