When dealing with sunlight, your two best options are to overpower it or control it. Otherwise, you'll be constantly adjusting your cameras and fighting color temperature and brightness.
Overpowering is more expensive, but a requirement if you plan on keeping windows completely uncovered during services.
Controlling is more budget-friendly, but will either require covering windows completely (curtains or shutters) or with some kind of tinting or neutral density gel/film.
A best of both worlds is to cover the windows with neutral density gel/film (basically a window tint without any color) and having enough lighting to overpower what's left of the sunlight coming in.
As far as lighting fixtures, I recommend looking at theatrical and studio lighting rather than video lighting like GVM. They're typically more powerful and have better control for lighting up a stage well. Ellipsoidals are pretty much an industry standard when it comes to powerful lights that can light a stage evenly and brightly. There are also fresnels that can be used within about 20' if you have a smaller stage. And a low cost option is to use PARs, but you will lack a lot of control and even light spread with them.