Does the fact that the marriage contract agent (wakeel) does not pray affect the validity of the marriage, given that all other conditions for the contract are met?

A marriage contract is not valid except with a Muslim guardian. A disbeliever has no guardianship over a Muslim woman, by the consensus of the scholars. One who abandons prayer out of laziness is, according to the preponderant opinion, a disbeliever, and thus cannot be a guardian for a Muslim woman. As for the guardian's agent, some scholars stipulate that he must be Muslim, while others do not. The preponderant opinion is that the marriage is valid even if the guardian's agent is not Muslim, due to the lack of clear evidence stipulating that.