Is it permissible for a Sunni girl to marry an Ismaili young man, and will their respective sects object to this marriage?

A Muslim woman is not permitted to marry an Ismaili man, because Ismailis are apostates from the religion of Islam. Their doctrine, outwardly rejectionist, is inwardly pure disbelief. The essence of their belief leads to the negation of the Creator, the invalidation of prophethood and acts of worship, and the denial of resurrection. This ruling also applies to the Nusayris and the Rafidah (Shiites); they are greater disbelievers than the Jews and Christians. It is not permissible to marry their women, nor for them to marry from among the Muslims.