If the RC church in America took visible and public steps to call for such a nationwide time of repentance, I suspect that some protestant groups and denominations would come alongside. I would hope so. But experience tells me that Protestanst often mock Catholics when we engage in days of fasting and abstinence. Ridicule us that we think avoiding meat or fasting is our ticket to salvation. I do hope this would be different.
SD
I've not seen that. Especially since many protestants participate in fasting and prayer and know it is for sanctification.