Ok, here goes. We install well over a hundred GE panels a year so I'll give you the run down on whats wrong IMO.

The neutrals on sub panel 1 are double lugged in a lug not rated for more than one conductor. Same goes for the grounding buss

The MBJs in the panels must be removed when used as a sub panel. The bar pops out by removing the two bolts at the bottom of the busses. Once that is done the bonding screw remains on the left bus to bond the can.

As for the 1/2" breakers, matter of choice for the contractor. Personally I dont care for them but these smaller panels are rated for them.

The outdoor service is using a TM820RCUFL as a main disconnect which has a main and 8 breaker slots in it and feed thru lugs (aka Trailer Panel). I would like to see the inside of that panel too. Its probably not installed properly either.

The mast is secured by one hole straps into what looks to be asbestos siding. Most likely it's not so structurally sound. Perhaps a guy wire for support might be a good idea.

Finally, Romex is a no no in any church in our state. Even if it they only have preacher and one member. MC, EMT and rigid is required by the state fire marshall.