Hi Jim,
I don't think that it has anything to do with "striking hands with the catholics and mormon churches" any more than saying that it is "striking hands" with them to go fellowship with a congregation (since they believe this as well). The Catholic and Mormon "churches" are in gross error and it has nothing to do with their opposition to homosexuality and abortion. Those are authentic BIBLICAL principles that two cults happen to share.
Remember: It is those cults who happen to embrace only certain portions of Biblical truth...and not the other way around. Thus, there is nothing ecumenical on the part of believers when those cults agree with the Bible on certain issues.
As for the issues of "helping the poor," immigrants on our own soil and seeking peace with all men:
I think that the problem with this statement is twofold. First, it implies that there are some (particularly "Conservatives") who don't believe in helping the poor, proper immigration or living in peace. And, it implies that it is an elected government's responsibility to take the money of taxpayers and disperse it to the "poor" in America. Those are assumptions that just aren't true.
I don't know anyone -- conservative or liberal -- who doesn't believe in helping the truly needy as a moral prerogative. It is the broad extent of that help which is often in question...and the idea about how just it is for the government (often rather than fathers) to raise children. There is a direct correlation between families with fathers and a much lower reliance upon government assistance. And, there are "need-based" organizations who operate under devilish means (like Planned Parenthood and other abortion groups).
I saw a young woman standing outside of our local Walmart asking for donations. Usually, there is a local Church standing there seven days a week asking for donations. However, the woman stated that her organization is trying to "increase access to birth control and abortion" for the poor and needy. So, any question about the proper way to help those in "need" or the extent of an elected government's role is legitimate.
The same is true about immigration. My wife is an immigrant to the United States. However, she did it legally. She worked as a migrant worker for much of her childhood. The issue about secular governments waging "unjust war" is moot in the sense that no one votes for individuals based upon promises of going to war. Moreover, I don't know anyone who believes in an "unjust war." They all think that the war is "just" before they get involved in such a situation.
Still, this is an interesting question. I have noticed that those who are often the loudest against government involvement are often quite vocal about government grievances. Many of those who don't want believers to "participate" in government are often either quick to enjoy the benefits of living in that country (invoking "rights," collecting tax returns, driving on government-built roads, using government-regulated internet, using the post office, etc...) or they argue that the government of consenting people should be responsible for a Biblical mandate to take care of the poor.
Many of these "secular" decisions are simply decisions about what is right, wrong or a better choice for a particular position. Like I said, the push for "homosexual marriage" will have an effect upon the Church. As pointed out, there are legal requirements that are tied to it. A Church -- including one that doesn't enjoy tax-exempt status -- could face legal scenarios that could be extremely costly in terms of money, time and concentration.
The same lawsuit scenario is true for small businesses owned or run by Christians who don't want to hire a homosexual, transvestite, etc... who might get angry if you don't offer them a job. There have been situations in which Christian bookstores have been sued because they did not hire homosexuals in a state where "sexual preference" was added as a factor in "discrimination." There have been "hate speech" laws in some states that have restricted the content of tracts and religious literature.
While it is certainly plausible to do this if the scenario arises, it could be averted or prevented if believers simply said what they thought about this issue during a statewide proposition or amendment comes to a vote.
I apologize for digressing from your post. However, I do think that we sometimes incorrectly associate voting "yes" on an amendment that retains the traditional definition of marriage as the same as "striking hands with catholics and mormons." In this case, it is supporting an ancient Biblical and moral definition of marriage as being between one man and one woman.
The Book of Esther is an interesting anecdote in this case. She was a Jewish woman married to a pagan king (who chose her, oddly enough, because of her physical beauty). Haman hated the Jews and wanted them destroyed (one of Satan's long-time plots...next to killing children). This was the political concept of "genocide." Esther faced a choice: She could have just left it into God's hands or risk her life by taking the step to voice her concerns with her pagan husband. Esther chose to share her voice to the king. By the grace of God (because the heart of the king is in the hand of God - Proverbs 21:1), the king acted on behalf of the people of God.