I think witnessing is what everyone does. IMO. I think everyone bleeds in what they belief in their discussions (there are exceptions, of course)ANyways so they're kicked out. Question why do Christians do this? Use a different religious room for their religious expression to go in and witness. ALso the bible says not to use trickery. They lied and manipulated their way in tried to make it look like they wer'nt witnessing when they were.
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When two people are expressing their thoughts and beliefs, it is always a "witnessing" of one's position. When one discusses why he/she is an atheists, buddhist, et al, -- ultimately they are witnessing their beliefs. I think that if, because of their discussions (witnessing what they believe), one changes their position because of the arguments given and made--that person has been proselytized into the other persons beliefs.
It is just that people have given a negative connotation to what everyone does.
Penguin is trying to convert my position on whether or not Christianity has had a net positive/negative influence. Synthesized, he wants to convert my position.
I am not offended by his efforts nor do I take it personal. ( Of course, he hasn't been able to hedge anything forward).