The Father would play the Serpent.
Jesus, the Drums.
And the Holy Spirit could be counted on for some fine vibes from the Theremin or aetherphone.
We’d all sing. Some reluctantly, some enthusiastically. But, by Gawd, we’d all sing.
Good choice
Or this “new” instrument by Da Vinci
All bagpipes out of tune, which means in tune. Hey, they couldn’t read, why should they read music?
I heard that there was some controversy when Jesus said “We’ll be more popular than the Beatles.”
As the Savior of mankind, Jesus is primarily concerned with our Deliverance; ergo, the only instrument that makes any sense for Him is the banjo.
No, they have Brian Auger to do the keyboards for them.
Exactly what I opened the thread to say, and it was right there in the first reply.
I will additionally note that Jesus obviously likes the spotlight, and even invents new dance-moves like the “waterwalk”.
I’m glad I had swallowed my mouthful of coffee before I read this. Well done! 
Why do I now picture The Holy Spirit as the Ed Grimley of the Trinity?
Don’t think we didn’t see what you did there, but BA could sit in with anyone and make it sound ‘heavenly’.
God plays harp
Jesus plays harp
Holy Ghost plays harp
The question is who is in tune?
I like the ideas above, but it gives … questionable mental images:
God on drums (Bill Kreutzmann)
Jesus on Guitar (Cap’t Trips)
Holy Ghost on keyboards (Pigpen)
Mary’s the nekked girl dancing on stage?
Wait, wait… Let’s add the Archangel Michael and St. Peter; you’d almost have The Eagles lineup. Think of it as Randy Meisner and Don Felder making a heavenly appearance.
Of course the Twelve Apostles are the backup singers - catch the close harmonies from Matthew, Mark, Luke and John, and don’t miss Judas’ falsetto.
I thought Neil Peart was God?
No, the backup singers should be Abraham, Martin, and John.
The Holy Spirit blows whatever horn it pleases. You hear the sound it makes, but you never know where it is going to come in.
I thought this had been done? They call themselves Crosby, Stills and Nash. Occasionally, John the Baptists tours with them as Young.
Whoa, whoa, whoa. You have to find room for Gabriel in the band if there’s some horn action called for…
The Trinity in various musical appearances… w8ith Satan as sideman:
Stadium Rock
God: Drums
Jesus: Lead Guitar & Vocals
Holy Spirit: Saxophone & Keyboards
Satan: Pyrotechnics (natch!)
Country
God: Fiddle, guitar
Jesus: Vocals Banjo
Holy Spirit: Drums Mandolin
Satan: KILLER harp!
Girl Group
Mary Magdalen: Lead Vocals (think Dixie Chicks or Diana Ross)
Virgin Mary: Backup vocals (handmaiden after all)
Holy Spirit (Yes, neuter gender) Backup vocals, violin.
backed by
God: Keyboards
Jesus: Lead guitar
Holy Spirit: Sax
Satan: Percussion
Symphony Orchestra
God: Conductor
Jesus: Brass section
Holy Spirit: Strings.
Satan: Tympani and percussion