I find the original post to be needless fear-mongering at best, and prejudicial at worst.
Has Massachusetts turned into a Mormon state with Romney as governor? Has there been a spike in recruiting there?
Did America turn blatantly Catholic while JFK was its president? Did his religion even matter after his election?
We should be looking at Romney's ability to run a government and see whether he's a good candidate to lead America through challenging times ahead. While it is valid to ask whether someone's religion will unduly influence the way they behave in office, it's hard to see where Romney has ever made religion an issue in his public life.