Building mosques is not un-American. In fact, it's very American -- it's the expression of religious freedom. Do you think building churches, cathedrals, meeting houses, temples, and synagogues is un-American?
Churches, cathedrals, meeting houses, temples, and synagogues are buildings that facilitate religious meetings.
Mosques are insurgent headquarters for a subversive political movement disguised as a religion which destabilized and subsumes every country it is allowed within.
No comparison.
Yes, mosques are un-American. Why? Because their cult does not allow a Government independent of Allah’s submission. Islam is a religion that has not progressed beyond the Medieval 14th century. Islam still accepts torture abroad.
Islam is directly incompatible with the US Constitution. Devout Muslims living in America are potentially wolf in sheep’s clothing.
Don’t believe me? Read the Koran (Quran). It will be sobering to you, I can assure you.