I actually a Japan with a large catholic population, like Germany nor the United States, but Catholic Japan sounded better at the time.
Oh, why didn't you say so.
(IOW, a better title would have been 'No Japanese Supression of Catholicism')
....
Still do not see this working without a lot more native Clergy and less weight being thrown around by the Iberians. Not to mention the degree of Syncretism that would take place in any case.
HTG