Is it permissible to marry a Catholic woman pregnant from adultery committed with her? Does marriage expiate adultery? Does the child remain illegitimate after marriage? And is an illegitimate child not blessed like a child born of lawful marriage?

The relationship you had was a kind of forbidden adultery (mukhādanah), and the expiation for this fornication is repentance with its conditions. A Muslim man's marriage to a woman of the People of the Book is permissible, provided she is chaste, but it is preferable to marry a righteous Muslim woman. Abortion is forbidden except in cases of necessity, and you must not assist her in it. The child is attributed to its mother and not to you, and it will not be held accountable for the sin of fornication. Residing in non-Muslim lands entails risks, and whoever fears temptation must emigrate to a Muslim country.