I've been waiting on this... B3wannabe would disagree with me but the bass guitar is the modern churches HammondB3. Church music has gotten so R&B, Soul, Funk and Jazz oriented that you can't really master modern church music without a bass. Of course I'm impartial to bassist because I am one. I also play keys...not an expert but I can hold basic chords and run a bassline with my left hand. Point being...I would never consider giving up bass for keys...that crazy man :lol: Seriously though the reason I prefer bass of over playing bass on the keys is that keyboard players can duplicate basslines that can't play them. Only a bass guitar can play play bass lines. You may get the notes but you don't the slides and slurs, hammer ons and offs. Wins of bending a strings, triplets, quads, and all the unique little tricks you can pull off with a bass.
Sounds like to me...you want a modern, more full sound.
Pray and ask God to send you a keyboard player is what you should do...worked for me.
Fingaz