ANSWER:

If one of the spouses apostatized, the marriage contract is dissolved and becomes invalid and the woman can remarry after her cycle is over. 

If muslim spouse becomes a kafir, will the marriage continue? Please give reference.

Apostasy, Fiqh of Marriage, Invalid Marriages | July 15, 2022 5:08 am
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If a couple got a proper Nikah but the man didn’t pray although he didn’t know the ruling on abandoning salah and assumed himself to be a Muslim, is the marriage valid and are the children that resulted from the marriage legitimate. What if the man had weak general beliefs? What should the kids do if they grew up with and were raised by this figure their whole life?
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In terms of wali, neither the father or his siblings are practicing and did not like islam or its teachings as the family have explained. Please could you guide me in terms of what is best to do given my current situation and what steps to take in terms of finding a valid wali as I would like a valid marriage. The girls maternal uncle is practicing and prays, is he able to substitute as a wali?