James, I'm making an assumption that your church has a sound board of sorts yes?
If so I've used an active pickup, all undersaddle, less feedback potential versus an internal mic and plugged into an active DI box with the 1/4" jack. The DI box will usually require phantom power from the sound board and it is connected to the sound board with a standard XLR cord.
take a read through
Leon Audio for a great write up on Active DI's
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