YOU made their religious beliefs about "end times" relevant to the thread.
But if the question is too sensitive for you to answer, just say so and I'll stop comparing their belief of "end times" with Christians'.
American Christians are not fundamentalists and because we are a secular country, it wouldn't matter anyways because our Constitution sets the law.
Christians are not going around terrorizing the entire world. That would be Islam.
Umm... the 47 Senators just pissed on the Constitution. Why on Earth would I believe the religious Christians among them wouldn't put their faith before the Constitution again?
No they did not. They are going against our dumbass ***** of a president to let the Iranians know that we do not accept a nuclear Iran under any circumstances. Fortunately, not everyone is a complete tard like the Obamatard.
Also, if you think America and Iran are similar, perhaps you should go stay there for a while. I can guarantee you, you won't be posting and talking about this stuff on the internet. Lol.
Of course they did. Nowhere does the Constitution give select members of Congress the authority to do what they did. You are clueless about the Constitution to believe that it does.

Furthermore, their actions could very well be in violation of U.S. law (the Logan Act).
Re: the Congressional letter to Iran...
1. there was no violation of the Constitution
2. there was no violation of the Logan Act
The President has lost the confidence of much of Congress, and much of the American People, with regard to his conduct in the sphere of foreign policy.
The President is no longer trusted to do the right thing -
especially in matters related to nuclear weaponry in the hands of mortal enemies.
There's too much at stake to leave this to Neville Chamberlain types.
Congress cannot stop the (now, somewhat distrusted) President from negotiating a bad deal.
So they openly and clearly inform the beneficiary (Iran) of any such pending bad deal that the deal will be renounced, the minute the President leaves office.
It's unprecedented alright, or, at least, highly irregular - and more than a little uncomfortable for most Americans - but those elected representatives and integral and fully-empowerd members of the Government (the branch that passes judgment on and ratifies treaties, by the way) decided that the situation had deteriorated to the point where such an intervention was necessary and appropriate.
Checks and balances - under extraordinary circumstances.
The Constitution still works... checks-and-balances are alive and well... inside and outside of a formal legislative process.
The letter-signatories broke no laws.
If you believe differently... wake us up when the US Justice Dept delivers indictments against the letter-signatories, for breaking the law.