This is nothing more than a couple of gay guys who were butt-hurt that some INDIVIDUAL had the audacity to accept their relationship as equal. Its petty.
Amendment 14, Section 1. All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside. No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law;
nor deny to any person within its jurisdiction the equal protection of the laws.
The right to equal protection under the law is a Constitutional right. If you wish to own and operate a business, you must treat all customers equally. Religious objections to the 14th Amendment have not held up in court. There are still people in this country who object to interracial marriage over religious grounds. If the owner was allowed to refuse this couple he could also, legally, refuse to sell a wedding cake to a couple where the man was black and the woman was white.
And seriously, if you're going to argue the Christian angle, let's get Jesus's words on this whole topic:
Matthew 25:
34 Then the King will say to those on his right, Come, you who are blessed by my Father; take your inheritance, the kingdom prepared for you since the creation of the world. 35 For I was hungry and you gave me something to eat, I was thirsty and you gave me something to drink, I was a stranger and you invited me in, 36 I needed clothes and you clothed me, I was sick and you looked after me, I was in prison and you came to visit me.
37 Then the righteous will answer him, Lord, when did we see you hungry and feed you, or thirsty and give you something to drink? 38 When did we see you a stranger and invite you in, or needing clothes and clothe you? 39 When did we see you sick or in prison and go to visit you? 40 The King will reply, Truly I tell you, whatever you did for one of the least of these brothers and sisters of mine, you did for me.
Now does this override objections to homosexuality in Leviticus? The bible answers that too:
Hebrews 8
13 In speaking of a new covenant, he makes the first one obsolete. And what is becoming obsolete and growing old is ready to vanish away.
People pick and choose the scripture they like in the same way that they pick and choose the amendments to the Constitution they like.