The most well known Godzilla films in the States are:
Godzilla, King of the Monsters/Gojira
Mothra VS. Godzilla
Godzilla VS. Mechagodzilla
I guarantee that most people here in the States, who only know of Godzilla as a monster movie character and probably haven't but one of his films, haven't heard of Godzilla VS. Megalon and, especially, Destroy All Monsters, The ones that have heard of Megalon probably know of it from MS3K, whose target audience was the very people that would probably watch monster movies anyway.
The films I listed I list because they include names of familiar characters, like Mothra, that the general public is most aware of, not that they've seen any of them. And Godzilla 2000 because it was released in the theaters here in the States.
Also note that it is getting harder and harder for Godzilla to find a younger, broader audience over here because cult films' appearance in general retail stores, from Wal-mart to even Best Buy, are being limited more and more every year. Whereas you used to find a bunch of Godzilla movies at Best Buy, you can't find hardly any there anymore. Hell, I couldn't even find the new Evil Dead 2 Blu Ray there.
By some miracle, I found it at Wal-mart. I used to be able to find a decent selection of Godzilla VHS' in Wal-mart, including titles from Scimitar, Sony (then Columbia/Tristar), and Goodtimes at Wal-mart, Meijer, and Target, as well dollar stores, Goodwills, etc. At the same time, we had a cult show on TNT called Monster Vision, which showed cult films such as monster movies and various horror movies. It's weird. There is a love/hate thing with nostalgia lately. People love it. They are willing to wear a shit in public, but they don't seem to eat up the property itself anymore, and stores are less willing to sell you any of the actual DVDs in store, but they sure as well will offer you a nostalgic Godzilla t-shirt for $7, because it would seem that people are more willing to buy that shirt than one of the movies themselves, or that is perhaps, what retail seems to think, and they are probably right, mostly.
As for the homosexual morons comment. One should have thick skin, but there is a thing called tact, which helps sell your theories to others better than calling insulting them. Such comments only makes one come across as naive and unpleasant.