Gay marriage right or wrong:
Three of your links are from right wing/conservative groups. Especially against gay marriage. They are extremely biased. I did not even have to go to the sites to know that.
Those three are #2,#3, and #5 on your list.
#2 is a polling company, if I recall and 'try' to write intelligently, but don't have research behind their writings.
#1 has no real barring on the argument at hand.