https://www.pewforum.org/fact-sheet/changing-attitudes-on-gay-marriage/
Catholics support gay marriage at the same rate as the overall US population at 61%. Catholics are more likely to support gay marriage than a republican (37%) or a black person (51%). Catholics make up about 23% of the christian population in the US.
That's even with the church's official stance being still anti gay marriage. And the entire reason is simple, it's not to discriminate against homosexuals but because the church's official stance on marriage is that the only reason to be married is to produce children. Since a same sex couple cannot naturally produce children it's not allowed. In that thinking it's the same as a couple who uses birth control or has sterilization procedures, although a huge number of Catholics do these things. In other words, it's like a rigid out date stance that most practicing Catholics don't pay that much heed to.
Indeed, of the countries where same sex marriage is performed, as listed on Wikipedia, a majority (15 of the 29) are predominantly Catholic countries. Of the remainder, it's the largest faith in Australia and Canada, and not far off in Germany, too.
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