Churches/synagogues/etc are burglarized more often than almost anyone would believe... except those of us who were police officers in previous periods of Life.
I'll skip the obvious irony, and just point out this: bad guys know that the business of religion (any religion, just so it's clear I'm not pointing to one in particular) is a very strong one and is also a consistent financial market; ergo, most churches/places of worship of any decent size have high-dollar sound systems and P.A. equipment, including nice power amps, a big$ mixer, mains, monitors, and usually a rack with comps and wireless receivers & mics. Add to that the actual instruments "locked" in a closet or music room with a typical interior door of much flimsier quality than the one on the outside the bad guys already got in through, and it's tweaker-in-a-candystore time. Plus, late-model computers, laptops, cash boxes or a small safe in the main office, and refrigerators full of food... on top of that, if it's more than a one or two-tweaker team, the third or fourth badguy outside can simultaneously be stealing the copper out of the air conditioner units.
Seriously, this happens all the time. Regardless of one's religious views or superstitions about a brick-and-wood building being holy or sanctified, the fact that church burgs are such a common occurrence is a simple and sad reflection upon the degradation of society overall. And a very justifiable reason for having, if someone like myself chooses, a very misanthropic and realistic outlook on the world around us, near or far. In case nobody is noticing, the world is a crappier place day by day. Things (society) are falling apart all over. I don't have the solutions (but I have ideas, though waaaaay too un-PC to expect to ever be used), I just have knowledge and awareness.
To the OP: I hope you get your stuff back... and that the legal system metes the appropriate sufferable punishment to the wastes of life who would steal from anyone instead of following the rules of the (lesser by the day) civilized population who have worked for, and earned, what they have.
Lastly, in the meantime, play bass with whatever you have. Life is short. And often unfair. Play while you can, as I do, as sonic therapy.