I’ve been doing the worship thing for years, so I’ll add my thoughts.
For the bass, I’d get a Precision. Something in the Squier line, whatever your budget allows. Any bass can work, but some basses require the player to know how to make them work. A P is very basic for the player, easy for the sound guy to mix, reliable and quiet. It’s a simple plug-and-play option.
For the DI, if it’s a newer church plant, I’m guessing they got a PA starter setup that includes a bunch of Whirlwind or similar DI boxes. Those are adequate. If I were bringing my own gear, I’d bring a better DI, but for the church itself, I don’t see any reason to splurge on a better DI than anyone else would have.
Pedals, I wouldn’t go down that road yet, other than a tuner. Pedals add a lot of variables that can be negatively impacted by someone who is sitting in for the week and doesn’t know the gear.
Edit to add: pedals need power. Power supply is a source of failure. Whether it’s batteries getting drained by things not being unplugged or wall warts getting unplugged or not having available outlets. Just something to consider.
As for the amp, if you’re looking for something that can allow you to play without PA support, a “practice amp” probably wouldn’t let you do much more than practice with some acoustic guitars or electrics with similar sized amps. It would probably have trouble keeping up with drums or projecting any real volume to a congregation. So I’d take a good look at amps with more power if you’re going to be using it for anything more than just practice.