The Bible never stated that they married; only that they were betrothed.
Jesus was Joseph's son legally because he and the Theotokos were betrothed. Betrothal in the traditional sense entails all the legal aspects and responsibilities of marriage, except for sexual relations.
Furthermore, that Christ was accused of being the result of fornication. Also, for the sake of argument, if the Virgin and St. Joseph were married at some point, it is clear that it happened after Christ's birth; so the flimsy argument that God "decieved" people would apply in either case.
Furthermore, where in the world did you get the idea that God had them get betrothed in order to hide things from Satan?
Exactly.
[bible]luke 1:27[/bible] They were only betrothed. it was a legal commitment.
[bible]luke 1:34[/bible]
Mary here herself says that she has no husband.
In Jewish marriage practice, couples were legal bound by betrothal. However, until they married, the wife continued to live with her parents. This betrothal was legally binding, which is why in Matthew, it talks of Joseph seeking to quietly divorce her.
[bible]matthew 1:18[/bible]
Notice how after angelic intervention, he finally agrees to take her into his house as his wife.
[bible]matthew 1:24[/bible]
In Jewish custom, they would have "consumated" their marriage that night. But Mary was pregnant, and the bible clearly states that they did not have relations, at least until after Jesus was born. There are multiple interpretations of this. Catholic and Orthodox believe in the understanding of "until" to mean, not up to that point, but does not mean that it occured AFTER that point. Most modern protestants (Luther, Calvin, Zwingli and King Henry VII all believed in the perpetual virginity) believe "until" to mean "not before a certain point in time, and then definitely afterwards". I believe Scripture supports the traditional understanding. Notice the word "till".
[bible]matthew 1:25[/bible]
[bible]matthew 22:44[/bible]
So, Jesus sits at God's right hand UNTIL God puts His enemies at Jesus' feet? And then Jesus will not longer sit at God's right hand?