Heterosexual married people do not 'own language' as you put it, Trentrader - any more than 'the gays'.
The 'hijacking' (your term) of you & I'm sure your lovely wife's 'holy matrimony' is not something the average garden variety 'gay' has even the remotest concern over - what are you really worried about?
I could go on about the evolution of language too...ie "when were you down to your last brass razoo, drongo?".
Newsflash - some words in the English language have - wait for it...more than one meaning!
As a gay (happy) married person - you do not own the rights to the term, the concept or the institution of marriage - regardless of what Uncle Fred Nile tells you.