No statistical data, but I haven't seen any negative anecdotal data. I'd bet money that marriage as an institution probably has the same positive effect on children in gay parent households, that it would under a straight parent family household. Afterall, marriage seems to have proven it's value as an institution for gays and lesbians as well.

Civil Unions were a mistake, and they've just made hedonistic lifestyles more prevalent as people don't treat marriage as a sacred institution anymore.

That's fucking silly. You're better off going entirely the other direction and removing the state from relationships altogether. A Civil Union is a sacred as getting a judge to sign your marriage certificate in Las Vegas, because that's all any marriage is to the state. A mechanism to identify how tax and benefit programs should be arranged.

At the first sign the partner is cool, they marry and then 2 months later, at the first sign the partner isn't 100% identical to them, they divorce. Bring back strong couples who know how to compromise and stay fucking married for their entire lifetime.

These are purely cultural problems. The state physically can't solve them, as the state can't, and shouldn't* try to solve social or cultural problems. You're gonna need to do the hard work of acculturating people into new behaviors using social pressures and morays, then teaching people why those behaviors are a good idea.

You'll have to have a missionary program in the US to re-civilize the Americans.

"O kind missionary, O compassionate missionary, leave China! come home and convert these Christians!"