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Well, a co-worker of mine is a voiced satanist. He is open about it and tries to get others to join him. He is very respectful towards me how ever and has never discussed his believes with me but I am always giving invitations to others at work and I play my christian music which he has heard in my work area but has never said any kind of comment about it to me.
Only on one occasion when I wore a bracelet that said "I AM SECOND" and he asked me what that meant. I explained that GOD is first in my life and I come second to myself. The next day he wore a satanic bracelet and as I passed him he made the comment to me" ha ha look at mine". Just wasn't sure, knowing that he is a satanist if I should invite him or would that make him hate me or take it as disrespect for his belief.... But I do feel awkward inviting those around him and not him...