The "nuclear family" is an extremely modern concept.The extended family is what is old as civilization itself.Sure, nuclear families existed 5000 years ago. But, it was far more common to live with your extended family.
While I'm not sure I agree with your point about liberals "destroying" organized religion, I agree that churches (and other place of worship) unite local communities and the members look after one another.
We should really be putting far more effort into building similar non-religious communities. Things like book clubs, hiking clubs, or anything that involves shared interests.