Beit Messiah Messianic Synagogue PO Box 887, Mercer Island, WA98040 Beit Messiah Messianic Synagogue is a congregation offering a place of worship for individuals and families throughout…More the area. It meets at the Mercer Island United Methodist Church. Regular services are held weekly and feature a full band. The Church offers special holiday services as well throughout the year. Childcare is available during all services. Please visit the website for more information.