Yes, sports is infantile, bur religion isn't. The people of Israel used religion as an excuse to come in and take the land from people of another religion and the subjugate them. As to the US being a Christian (easy word to spell) nation, it is as Christian a nation in terms of population density as Israel is a Jewish nation. We just don't institutionalize bigotry any more.
Yemen's Houthi rebels commit to peace plan in letter to UN chief, BBC reports (Haaretz)
from the article: Ravens dismisses NFL season opener on Rosh Hashanah