Answer: The practitioners are not part of a cluster.
Explanation: A cluster is a group of things or people that share similar characteristics. In practitioner's case they come from different states, counties, cities, and houses of worship (professing a different religion) so they have nothing in common.
Answer:
What is the meaning of red line?
to cross the red line
The Red line, or "to cross the red line", is a phrase used worldwide to mean a figurative point of no return or line in the sand, or "a limit past which safety can no longer be guaranteed."
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Manifest Destiny is the belief that Americans had the right, or even the duty, to expand westward across the North American continent from the Atlantic Ocean to the Pacific Ocean. This would spread the glorious institutions of civilization and democracy to the barbaric Native Americans.