I'm not offended by Christmas decorations, nor am I offended by the decorations of other faiths. Where do you the idea that "many Americans would throw fits?" The media? The media seeks out the nut wings of society and their extreme beliefs to get ratings. Those portrayals are not reality in most areas.
Most Americans are fairly tolerant people. (Yeah, there are some assholes, but you don't think there are assholes in other cultures? Really? How do you think Christmas or Hanukkah decorations would go over in Saudi Arabia or Iran? Any "fit throwing?" Maybe some death penalties, instead.)
I find your assumptions about "Most Americans" to be a bit naive and judgmental and painting an entire society with one broad brush. Most Americans are not as uptight and intolerant as you portray them.
In the USA Christmas has become a fairly secular holiday. In most public displays, there is little "Christ" in Christmas. As long as it's on private property, people can get as religious as they like. Although, I rarely see anything more than a nativity scene on private property. Such things are simply not allowed in public venues in the USA.