What is the ruling of Islamic law on the marriage of a Muslim woman to a young man who belongs to the Tijani Sufi order?

It is not permissible to marry a Tijani if he believes in apostatizing doctrines such as the unity of existence (wahdat al-wujud) or that all religions are true. His family must be advised because "religion is advice." If his innovation is not apostatizing, then he should not be married to a Sunni woman. Scholars have warned against dealing with innovators, and some have even gone so far as to say that an innovator is not a suitable match for a Sunni woman in marriage.