This hardly seems like a coffee house topic to me, as it is extremely volatile.
It is hard to see where else it should go.
I don't understand why the religious right wants to do this. If marriage becomes a constitutional issues, then marriage becomes an entirely civil institution. The proposed amendment, in effect, abandons all claims that marriage is a religious sacrament.
This proposed amendment has very little chance of becoming part of the constitution. This is the religious right flexing its muscles, raising an inflammatory issue in order to influence the vote on other issues.
This is not about individual marriages. This isn't about YOUR marriage or anybody's marriage. This is about the meaning of a cultural institution.
The meaning of a cultural institution is determined by the culture. A constitutional amendment will be about as effective as King Canute trying to hold back the tide.
*If* that's possible, and *if* homosexuality isn't environmentally produced, ...
You seem to be assuming that if homosexuality is enviromentally produced, then your community would be exempt. I doubt that there is any basis for such an assumption. The environmental triggers might be quite subtle.