No, of course not. That's a stupid question. I know I know, "There's no such thing as a stupid question." We tell our kids that, junior employees, people we're presenting a brief to, etc. However, this is a stupid question. No-one but a psychopath would want a war, period.
Do 300 million Americans want to take on 1.4 billion Muslims...
Not sure we have a choice. Radical Islam has already declared war on us. It remains to be seen what percentage of Muslims are going to sit idly by and watch a few madmen pervert their religion for the sake of worldly power.
...who will be at least temporarily united after Washington and Israel start a war on Iran?
Again, just plain stupid. This person is a professional writer and/or analyst? I think not. Neither the US nor Israel will start a war with Iran. Either or both may initiate a limited military strike against selected targets (yes, technically an act of war), but neither is going to pursue an ongoing military engagement with Iran. (ie. a war)
The writer is a professional anti-Semite that attempts to disunite the country. Fortunately, his stupidity is obvious. Others of the same ilk, such as P. Buchanan, are (slightly) more subtle.