Indeed there certainly could be something wrong with him ! And if these odd behaviours represent a real change in his usual behaviour, they should be some cause for concern. This could be a psychotic illness starting up for instance. ( you didn't menion his age, as early dementia might also possibly be relevant ).
I don't see much genuine religion in wasting hours talking about what one should do to help others, rather than actually helping them.
The issue then becomes how can you best persuade him to see a doctor, maybe initially a good GP, but ultimately it must be a good psychiatrist, for a full assessment and a discussion of the findings and treatment options.
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