IMO... you weren't "replaced" or "pushed out" of anything. Adding more instruments doesn't mean you've been replaced. Not being unsympathetic but nobody did anything to tell you that you were being replaced. A random person thanking you for filling in is completely irrelevant as that person is only reacting to what they see.
And, the worship pastor not giving you a directive of what your future role would be, could indicate again that it was the same as it was now. Or, that he needed to try it for a while and see. Just play electric guitar. There is not only no rule about not having more than one, but I swear I watched a video someone put up here recently with praise and worship team that had at least 3 electric guitars. Maybe he wanted to hear it for a while and then make suggestions on how to do things differently from each other, such as play different versions of chords, or one strum, one play arpeggios, or making your tones varied, or any of the other million ways multiple guitar players can fit in a band.
Sorry man... I think you messed up. If they wanted you out, I would have MADE THEM say so. THEN, they would have done something wrong. But you basically asked them and they didn't say so. When you quit without any indication that they wanted you out, it's only reactionary speculation. I'm sorry you feel they way you do, but from what you said, you're only out because you chose to be out.