At a few Catholic funerals I've been to, the priests acknowledged that not everyone there would be Catholic or Christian, and still encouraged everyone to join in the more universal parts of the prayer service. I take that as a general guideline: paying false lip service to a god and religion I don't follow would be offensive, but visiting a church for a good reason and being respectful and joining in prayers in a general fashion, nothing to be offended about there.
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At a few Catholic funerals I've been to, the priests acknowledged that not everyone there would be Catholic or Christian, and still encouraged everyone to join in the more universal parts of the prayer service. I take that as a general guideline: paying false lip service to a god and religion I don't follow would be offensive, but visiting a church for a good reason and being respectful and joining in prayers in a general fashion, nothing to be offended about there.