I've got a 486 in here right now, keep playing with different configs, but with as little as a 486dx-33 and 12 meg of ram it's a PERFECTLY USEABLE machine for browsing the web, checking email, recording/playing back wavs, etc. Running Win95 and IE5.0 currently, old ISA NIC and it's on the cable connection. No, it doesn't play mp3s worth a damn (will with the AMD chip at 160 fine) at the speed you have, but if the church is willing to give you some place to set them up, go for it.
Some uses for the church members I can think of:
First, for software - old and outdated by "our" standards would be great - remember those using the computers there are likely to be people who don't have their own at home, hence don't have as much experience and won't miss the latest and greatest. Best yet, see if church members would be willing to donate their copies of software they don't use anymore.
Word Processing (not everyone has a computer yet) - have a printer available too of course.
Get a simple graphics program so people can make cards/small banners.
Old copy of Printshop would be nice here. A graphics editor like an old copy of Paint Shop Pro would work nice for a machine like that (About 5 meg total I think for PSP3).
Spreadsheet program.
Web browsing (turn java off though)
Email - print up and laminate a tutorial to show people how to sign up for web based email so they can email friends/family/whatever. Make sure autocomplete is turned off in the browser for the passwords.
They may be slow, but for an adult education class in basic computer learning they're plenty fast. Network them so they do have access and see if anyone would be interested in doing an hour a week class some evening.
If there's any space left, put some old DOS games on them to keep the kids busy while the parents are using the treats as you call them.
And so on
Comon guys and gals, I'm sure we can think of other legitimate uses. Not everyone has or needs their own computer, but could get use out of these.
--Mc