It is possible to start and use OpenLP using wine. And it should even be possible to get OpenLP under wine to use PowerPoint Viewer 2007 - I've done it myself once, just to see if it would work. But personally I would not do it on a "production setup" that would be used during church service, I think it would be too unstable. I think the same about a Linux - Wine - OpenLP - PowerPoint setup...
But feel free to prove me wrong ;-)