I am only persisting in this argument so that you can lighten up and not worry about your friend so much.
Presbyterians, people who belong to kite flying clubs, Amway salesmen, people who are fanatical about Star Trek, etc. ad nauseum-- ALL invite non members to social functions (ie. picnics) in order to maybe attract new members--this is not necessarily a menacing thing. Go to the picnic,
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Destructive Churches