Is the validity of the marriage affected by the daughter's doubt regarding the Islam of her father who utters words of disbelief when angry? And is the marriage performed by a disbelieving father—should his disbelief be proven—considered valid, similar to the marriage performed by an unauthorized person (فضولي) if it is ratified by the other guardians?

We have previously clarified in a fatwa that your father is not considered an apostate if he uttered words of disbelief while unconscious due to extreme anger. If he apostatized and then repented, the marriage contract remains valid. However, if the marriage contract was concluded while he was an apostate, the contract is invalid, and the presence of paternal uncles does not validate the contract as long as the father himself performed the contract.

What was reported from Ibn Taymiyyah regarding the validity of a disbeliever's contract does not include the marriage of a Muslim woman, but rather the marriage of a disbeliever to his disbelieving daughter, as he sees no Sharia-based evidence for the invalidity of such a contract.

We advise you to ignore these whisperings (waswas) and not to dwell on them, as they lead to evil and tribulation.