Don't let ignorance get you. Shouting "God is Great" is nothing bad. It just happens that extremists use religion to justify thier actions. The comparison is one of us giving thanks to Christ in church while some Christian extremist doing so while killing someone.
What pray tell is wrong with yelling """God is Great"? I suppose you are against using the arabic word Enshauallah meaning "God Willing" also. Try not to be quite so ignorant.
This is my rejoinder: