When Pope Saint John Paul II visited Columbia, South Carolina in the late 1980's, I made a pilgrimage there with parishioners from Savannah. It was an inter-faith liturgical service and Michael Keaton was selected to read one of the Scriptures. It took place at the University of South Carolina's outdoor stadium. It was the summer and temperatures were in the upper 90's. It was sweltering!
At any rate, Michael Keaton's Catholicism has impacted his life and worldview and it is good to see actors witnessing to their Faith even if it might marginalize them with some in Hollywood.