Interestingly, my diving-related friends have been more genuinely helpful than the church friends. When I had car battery issues lately and posted about it on FB (almost made me late for the dive boat!), a diving friend offered to help me get a new battery - on Labor Day and installed it in my car on Labor Day. I hadn't asked for battery help, the offer of help was just extended.
When I've posted requests for help with moving a piece of heavy furniture or for a loan of a correct sized tool to change my license plates, it was all diving friends who responded - none of the church friends did at all.