Dan Brown's web site has some great stuff- and while no one can really know whether the two were ever married, the Jewish scholar Josephus certainly mentioned Jesus' siblings so there are possibly relatives out there somewhere. Whether he himself fathered children we do not know - or it was not recorded. The Gospels are so cryptic and all have differences (One of my best friends is an OT and NT scholar and we discuss this all the time, I find it fascinating!) - so they are not historical documents. The early Church indeed incorporated so many of the myths from other religions. My friend - who is a Roman Catholic nun - is fond of pointing out that following the Ten Commandments does not necly make one a good Christian - it does mean you are an observant Jew however.
Like many who have read prodigiously in theology, I take issue with much of the Pauline work - since Paul had his own agenda (didn't they all, lol) - tho I love toe quote Galatians 3:28 for my own reasons, <g> I always thought the Sermon in the Mount is prob the best mission statement for anyone who professes to be a Christian - not in the sense of the mission in the religious congregation sense you understand (can you tell I have a convent education, lol?)
I also love to point out to folks who argue against the ordination of women in the Catholic Church that if we listen to the literal stuff, then only Jewish male fishermen would qualify to be Priests in the Christian Church. Christianity of course iseasily the most suvcessful of the many Jewish sects og that ear - I am also fascimnated by the Dead Dea Scrolls (and other work of the Essenes). And there has been much work about the role of Mary Magdalene much before Dan Brown came along.
There is also a great article in an old issue of America (US Catholic theological journal) called "Blame it all on Constantine" - and it points to how this ruler used Christianity for his own purposes and changed it almog the way. (If you are near a univ or theological school library, the article was printed in maybe 1975-76?) - and the archives may also be online if you have lexus nexus, even google may do it for you,
Brown's book is a work of fiction but it does promite intriguing debate!