Could shield of faith cast by multiple casters stack on one creature?
Spells don't stack with themselves.
Combining Magical Effects:
The effects of different spells add together while the durations of those spells overlap. The effects of the same spell cast multiple times don't combine, however. Instead, the most potent effect — such as the highest bonus — from those castings applies while their durations overlap. (PHB 205)
As long as an effect is active on the player, you can't stack it, casting it again would just extend the duration.