There is one obscure school of thought that Jesus was married to Mary Magdelene, fathered one daughter and two sons, divorced Mary, traveled east, studied Buddhism, and died in Srinagar, Kashmir, at about 60 or 70 years of age. The two sons are supposedly ancestors of the Merovingian Frankish dynasty, which preceded the Carolingian dynasty (Charlemagne, etc.) on the throne of France. (Apparently Emperor Constantine shared some of this ancestry through his mother Helena, born of noble British blood.) Some allege that the heresy for which the Templars were destroyed was the belief in and allegiance to the persistence of Jesus' royal line, which is also the line of David and Solomon. The book "Holy Blood, Holy Grail" gives more detail on this theory.
As to religious belief, I guess I am limited to believing in God as my creator and Man as my brother. The rest, I will find out in time, and, pending that, I think God would rather we follow the Golden Rule and honor God's creatures, our fellow humans, than worry about what exact name we should address God with and similar minutiae.