A license is, by definition, government-granted permission to do something that is otherwise illegal. It means, in the case of marriage, that government has usurped the authority to grant permission to engage in a ritual that has existed in various forms since prehistory. The origin of marriage licenses around the world is based on class and race segregation, not some social need. Getting equal permission to marry misses the point, because the permission doesn't need to be granted in the first place.

As for the gun, just look at the gay wedding cake debacle from a while ago. Government guns were brought to bear against someone who didn't want to make an exchange. No one was shot, but the implication of "comply or die" is always present with police and courts. All because one baker declined to bake a wedding cake? Hostile discrimination is real, but in that case, the LGBT crowd were the bullies using government against someone who as exercising his right, whether rightly or wrongly, to choose how to operate his business. Had the courts agreed with the couple, the guns would have been brought to bear in a much more real sense.

Gay marriage? Fine. Do what you want. Call it what you want. It doesn't threaten me. But when you demand that a church allow you to hold your ceremony in their building and provide and officiant regardless of their doctrinal objections, and demand government enforce that, it isn't equality anymore. It's not fairness or justice. It's violating the rights to freedom of association you want for yourself.

As for voting, no one has a right to vote. I have written at some length on that topic elsewhere. Here, for example.