Given what you post, do you have a plan for when they decline?
I realize that everyone’s position in life will be different at this point, but I expect most will know whether their religious objection will be accepted, or not. If it would be accepted, I would think the mandate would not actually be there, in most cases.
It seems given, to me, that an employee with this mandate is heading for a break with their company or forced compliance. Yuck! Breaks are usually best made clean.
I hope that you still have options for resisting this.
We shall see what happens...