Is it permissible for you, as a Muslim residing in America and holding a license to solemnize marriages and authenticate marriage contracts, to solemnize the marriage of a Christian man to a Christian woman?

Firstly: The marriage registrar is not a condition for the validity of the marriage contract; rather, he is an instructor and a documenter.

Secondly: It is permissible for a Muslim to officiate marriage contracts for non-Muslims if two conditions are met: 1. That the conditions for a valid contract are present, such as the presence of a guardian (wali) and the consent of both spouses, and that the woman is not forbidden to the suitor, because it is not permissible for a Muslim to assist in a void contract. 2. That the contract does not take place in a church, or lead to hearing disbelief or anything similar, based on the verse: ﴿And He has already revealed to you in the Book that when you hear the verses of Allah being denied and ridiculed, do not sit with them until they engage in another conversation. Indeed, in that case, you would be like them.﴾ (An-Nisa/140).

If these two conditions are not met, then it is not permissible for a Muslim to act as a marriage registrar for the marriages of disbelievers. It is advisable to focus on the marriage contracts of Muslims, in preservation of the religion and to avoid tribulations.