"Jesus would rather kill, not marry, gay people" - Franklin Graham

[Angrboda]

See bold. Do you think this alone constitutes bigotry?

The point of the study was that it wasn't that alone which typically motivated the opposition.  As already noted, I don't have an answer to your specific question, aside from that it appears to be nothing more than an ideologically motivated excuse used to provide cover for bigotry and prejudice.  If you have any actual facts aside from fact-free and ideologically motivated drivel to contribute, then I'm all ears.

The following is a comment on the same study quoted above, and so does not imply independent corroboration, but rather fills in the rather stark explanation given by the study's authors.

Is opposition to same-sex marriage driven by anti-gay attitudes?

O’Connor’s research shows that contemporary opponents of same-sex marriage rarely use overt sexual prejudice to justify their position. This was not always the case.

A 2001 study of attitudes to same-sex parenting found many critics argued homosexuality was sinful. Now, instead of expressing explicitly anti-gay attitudes, many same-sex marriage opponents appeal to their beliefs about factors other than sexuality.

In contrast, proponents of marriage equality sometimes accuse opponents of being motivated by homophobia. They may view opposition to same-sex marriage as intrinsically homophobic. Alternatively, they may see opponents as insincere for failing to declare the real, prejudiced basis for their attitudes.

Who is right? Is opposition to same-sex marriage primarily a matter of religious or political principle as opponents suggest? Or does it largely reflect antipathy to gay and lesbian people, as their critics maintain?

Research by Dutch social psychologist Jojanneke van der Toorn and colleagues suggests there may be some truth to both points of view. They conducted a series of studies in the US and Canada in which they assessed people’s levels of religiosity and conservatism and their degree of support for “gay marriage”. They also assessed anti-gay attitudes, such as endorsement of statements like “homosexual behaviour between two men is just plain wrong”.

The studies yielded very consistent findings. Religiosity and conservatism were both associated with opposition to same-sex marriage and also with anti-gay attitudes. Roughly two thirds of the association between religiosity and opposition to same-sex marriage was explained by those attitudes.

More religious people were more opposed to same-sex marriage primarily because they had more negative attitudes to homosexuality. Similarly, conservatism was primarily associated with opposition to same-sex marriage because conservatives held more anti-gay attitudes.

This research indicates that much of the opposition to same-sex marriage is grounded in sexual prejudice, despite that opposition often being publicly justified on different grounds. But, a modest proportion of conservatives’ opposition was not explained by prejudice. This fraction may reflect principled objections based on conservative political or religious beliefs.

Attitudes to same-sex marriage have many psychological roots, and they can change

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I think that's an open question, the resolution to which you've done little to further.  It seems your complaint is more that people are being people in this thread rather than that atheists are being atheists.  If that's your problem, by all means, keep pissing into the wind if it makes you happy.

You don't think it should be pointed out that opposition to same sex marriage does not necessarily entail bigotry? That that untrue conclusion does not create further division? 

Listen, I knew gay marriage would eventually happen. I don't think I actually personally care very much other than to recognize that God is intolerant of it. Just trying to correct idiotic assumptions, misperceptions, demonization, etc.

I think there is an astoundingly wide gap between your stated goals and your actual accomplishments here. Take that for what it's worth. Void where prohibited by law.