You could not possibly be more exactly wrong in this assertion. I am going to assume that you have, or are currently receiving, a public education, so I will go easy on you.
MOST Americans believe in G-d. MOST Americans--and I stress, MOST--are Christians. A local governing council allowing a religious minority special priveleges not granted to a religious majority certainly affects MOST Americans. It is sending a very dangerous message to all other city councils: give Muslims what they want, period. This affects you, as well as MOST Americans, far more than you realize.