I am frequently amazed at peoples' ability to take rather innocuous terms like "marriage" and "sexuality," and toss the word "Biblical" in front... (As if this has any relevance--except to turn one's personal beliefs into dogma.) One need not question "the authority of Scripture" to understand that one's personal interpretation of it is extremely subjective and open to err. (Remember when inter-racial marriage was "un-Biblical?")
I am elated that my best friend now has the same right to marry I always have, but I don't need you to celebrate with me. My only advice is: A God continuously "threatened" by social reform/ pluralism is a weak one. Peace.