Mreeed
Yes, I have attempted to use powerpoint in a worship setting (VBS). I attached the files to a slide and the music continues to play while moving through slides. It has been a while since I've done it so updates in powerpoint may or may not have made it more complex. As i remember you can also set a timer on the slides so it would move along with an audio file without someone actively changing slides.
I'm guessing you want to create worship videos with lyrics? If so a video making program is also not a bad option. Depending on how much you spend on the video program though the complexity and functionality can be good or overwhelming.
Someone mentioned ProPresenter in an earlier comment. When it comes to Worship Software it is a God send. I do realize that the 399$ price tag hurts the wallet on smaller churches. Let me lay it out for you though, this program is great, it will integrate video, audio, slides, and even powerpoint into it. The price tag is well worth it. It will take a little bit of learning but there is a bank of youtube videos from the actual programmers to help. If your church has the equipment to display lyrics, etc on stage you do best having a program meant for it.
You mentioned copyrights as well. I don't know the depth of knowledge you have in the copyright field (I'm not the best with it). If you are a paid member of CCLI you have your individual account number. In the case of ProPresenter you enter this number into a section on the display page. From there you can choose to display the copyright information on a song on First, Last, Both, or Every Slide. Unless you are importing songs from SongSelect though you will have to enter the copyright information manually one time. Once again though, ProPresenter is a great tool for doing this.
If I am correct, you can still download Propresenter from
Download ProPresenter | Renewed Vision
You can give it a spin at home on your own computer and see how things work. Mind you if you attempt to use this in an actual setting it displays a giant PRO6 logo on the screen. It is great though if you're working from home or if you just want to play around and see if you like it.
God Bless,