Homophobia isn't a sin. Lust Gluttony Greed Sloth Wrath Envy Pride I'm not seeing disliking sly boys in that list anywhere.
All of them, potentially. Mostly Pride, if I understand what you mean. Killing someone "just because" you have the power to do it.
I'm pretty sure most of homophobia is lust-driven; it's surely either gluttony or greed to overstep the bonds of your own private space and judge that of others, and the motive to do so is usually a form of envy or pride; following your fears rather than rational argument is definitely sloth, and if you like to talk yourself into a rage about it it will even cover wrath.
Oh hell, I'm a fan of all seven. But right now, I'm gonna have to go with wrath. * Elwood bans Packard.
Zooooooooooooooooooooooooooombieeeeeeeeeeeeeeeeeeeeeeeeeeeeee! Wordforge! Plan Delta-Shaun-3, Execute!
*frantically opens a small locker, takes out a large rifle, and fills it with maple syrup.* Oh, DELTA-Shaun... my bad.