I am an ex-Muslim who was forced, if that is the correct word, from kin and country for leaving Islam (first for Mormonism, no less - outright polytheism, which goes over even less well than Christianity to tawhid-obsessed Muslims) under the possibility of the Shariah’s sanction for apostasy - death. So, I know a good deal about shunning, again, if that is the correct word, or being sanctioned, to use a broader term, for the leaving of a system of religion in order to pursue truth (my father was a very secular Muslim pan-Arabist Marxist sort, so little opposition came directly from them, my parents, if not through them). If you want me to expound, ask, and give me some pointers, as the general conversion story/testimony I give is much condensed and completely passes over the personal aspect, dealing only with the doctrinal and philosophical.
I do not believe I am not called to marriage and have not had children, so I can not comment on that aspect of shunning (as one mentions above, the turning of children against parents, of wives against husbands), although I was technically married under the Islamic laws of nikah for several weeks.