Howdy! I am back from a week long mission trip in Louisiana; our church group helped repair 2 homes damaged in Hurricane Rita and myself

and "another total knee replacement person" helped with their volunteer office files. (No wonder the new staff couldn't find anything

)
Anyway, I am going through my photos and selecting my best ones that will be added to a slide show of photos taken from other camera owners who were also on the trip. I'm not the one making the slide show itself, but I am running my photos through Photoshop CS2 and then putting the collection on a CD to give to the person who is creating the Powerpoint show that will be shown at a church service on Sunday April 29.
My question is what RESOLUTION do I need to set my photos? I've asked this question elsewhere in other years and the only reply I get is that it doesn't matter, the projector sets the resolution.
From past experience, it does make some differences!!!!!!!! If I DO NOT change the resolution at all -- Image re-size (not bicubic), the whole photo is not shown in that PP slide--people on both ends of a large group (in 1 photo) become 1/2 a person or are missing totally from the photo slide in PP. It happens in the powerpoint program only. If I DO change the resolution to 300 ppi, same as in ready for printing, the whole photo is there, but it is slightly smaller on the rest of the photos in the PP show.
The last 3 years of mission trips and it always happens. This year I do have a different digital camera than in the past. The default resolution from the older camera might have been 96 ppi; don't remember for sure. The camera I took on this trip, the default resolution IS 180 ppi when straight from the camera.
When you professionals make a PP presentation from your photos, do you do any photo resizing changes at all and if so, what changes do you make? If not, then what is the default resolution of your jpg photos, when straight from the camera? (My camera(s) shoot jpgs only, no RAW.) So if your camera shoots Raw + Jpeg, what resolution is your jpeg? If you shoot RAW only, what is your resolution setting when you convert your RAW file into a Jpeg???
Please do advise.
Thank you!
Sincerely, CarolynM