I am far from being any kind of expert on this subject but, from what I've seen and heard, worship guitar playing seems fairly basic (such as a high proportion of Country songs, but with a high emphasis on effects (eg. multiple repeats of delay and reverb that goes on forever)). Basically, if you learn Country, you can play 'Worship'. For the record, I'm a Christian and find nothing objectionable in Country song lyrics. The skills are transferable, and once you can play it becomes easier to work out how to play a song or follow TAB (or manuscript if you're brave enough?)