Well, while we are missing the point: Being against gay marriage [and why do we assume that HAS to mean bigotry? Does opposing something automaically mean bigotry? Because I oppose that kind of reasoning] has nothing to do with the issue of two dads.
A. My wife had two dads - not admittedly simultaneously - with no issue of "gay" [awful term] marriage.
B. Jesus had not only two dads - who were NOT in any kind of sexual relationship I know of] but also a very present mum.
C. So far as I have heard, those - bigots or otherwise - who do object to setting up a government ratified status for homosexual relationships do NOT base their nonsupport or opposition on the idea that "two dads is bad".
So the poster - while admittedly cute - is, like a lot of cute things, stupid because it neither accurately describes Jesus' home life [not speaking about other's views on outcomes] nor says anything relevant to the pros and cons of opposition to families centered os homosexuality or polygamy.