You might want to think about mixing up the band a bit. Do you have access to an acoustic bass? Even if you don't, tell the electric player to grab an acoustic and have him play along with the leader , but voice it differently. For example, the song is in E, the leader plays it in an open voicing (E), Acoustic 2 plays it in D with a capo on the 2nd fret. The acoustic bass will blend much better than your electric but electric will still work. The combination of acoustic, electric and bass with no percussion is kinda funky, especially for praise/worship. 2 acoustics and an acoustic bass make it appear as if your supposed to be set up that way, not like someone is missing. Who's leading anyway, the acoustic player? He will probably establish the "rhythm" of the tune with his strumming...you shouldn't have any trouble picking out a groove...keep it simple, root note...lots of quarter and half notes....solid "hold-down-the-fort" type basslines. Creative doesn't always mean busier. You're not trying to emulate a full band by having everyone else "fill-in". I'm basing all this on the statement you made about your skill, which is kind of new. Obviously, more experienced musicians may be able to pull off something more complex, but it's cool to take small steps until you see what works and what doesn't. God Bless bro.....