Should President Obama have given his endorsement to the mosque?

I am for anyone having their own religion. This is America. But, sometimes, especially the President of The United States, a person should keep the seperation between church and state. Meaning this: was his endorsement of the planned mosque, near the bombed twin towers, ethnical? He is muslim, the bombing terrorists were muslim and the planned mosque is muslim. Somehow, someway, this three-way combination has a bad smell to it. Question: by endorsing this planned mosque and his affiliation with the muslim religion, has President Obama “crossed the line” in his ability to be a leader of our country?