The ketubah, or wedding contract, is presented and signed by the groom and witnesses. The ketubah delineates the groom's responsibilities to his wife. The seven Blessings are recited. An interfaith marriage can be a beautiful celebration of diversity and unity. Some religions allow officiants from other faiths to perform ceremonies in their houses of worship.
Many people have two ceremonies of different faiths back to back.
Consult with your house of worship to see what their policies and requirements are. For example, the Catholic Church will marry a Catholic and a non-Catholic. The non-Catholic does not need to convert in order to marry a Catholic. A Catholic and a Protestant can marry in the church with one officiant from each denomination performing the ceremony. Non-Christian clergy are not allowed to perform ceremonies in the Catholic Church, however.