I'll take these in order:
1. No, not breaking new ground, yet for something that you now claim to be so obvious, you failed to consider it in your argument, which is why I brought it to your attention.
2. Yes, everyone is influenced by their culture. BUT, in the US, we have specific constitutional and legal traditions specifying that church and state are to be separate, which complicates the matter. I fully acknowledge that people do not necessarily compartmentalize--but this doesn't mean in some cases they shouldn't. I use the rule of thumb, if your policy preferences are influenced by religious belief, you should be able to articulate a clear secular rationale for the policy. If you cannot, and inevitably rely on religious belief or dogma as the basis for the policy, then it has no place in the policy debate. (This is ultimate the reason why opposition to same-sex marriage will fail in the long-run, there is no strong secular rationale to oppose it, nobody can, for example, articulate any harm that befalls anyone by legalizing it to justify the denial of civil rights to a large group of people. Opposition to it ultimately falls back on religious beliefs about sex and marriage. Well, that and today's generation and future generations increasingly fail to see gays as abstractions but increasingly see them as real people.) For all of the LDS faithful in Utah who see no problem with the degree to which the LDS Church dominates politics in Utah, I would just love to see how they'd react if the tables were turned, say, if they lived in some Red Bible Belt state and policy where policy is driven by Evangelical Christians. My guess is that they would find the exact same arguments used against them that they are using here, and I'd bet the farm they wouldn't like it one bit. To me a principle has little value unless it can be consistently applied. You need to ask yourself whether IF the tables were turned, you'd still feel the same way.
3. This last one is a doozy. I made my last statement about you needed to improve your observation skills to juxtapose it to the nearly exact same thing you said to the other poster. In other words, I used YOUR debating tactic against you. All I can say is that if you don't like this particular debating tactic, then don't use it yourself.