Definitely! Exclusion based on fear. The reasons behind denying a group of people the right to marry based on their sexuality are all hidden behind this weird and confusing rhetoric of wanting to protect this ancient practice that cannot be changed because God wanted that way. What they really mean is that they don't want to share what they believe to be a heterosexual union with anybody else, everybody else being LGBT people. It's exclusion, it's separating themselves from another group of people. It's a fear of LGBT people that produces an opposition to same-sex marriage, which is the definition of homophobia.