In brief as I have said this too too often:
it is commitment that makes a marriage, not the gender of those making the commitment
marriage between LGBT people supports the so-called institution of marriage, and strengthens families, it does not weaken them
I totally agree with Beth and Kelvin on the ill-judged, ill-informed and down right stupid statements from the Scottish hierarchy of the Roman Catholic church these last few days.
Working Hypothesis 
And as I have probably said before: Hear hear!
There’s so much more important stuff they should be focussing their energies on. Get out of the bedroom and deal with real issues!