Google : Catholic Church; illegal immigration.....documented proof of a concentrated effort to support blanket amnesty of "the undocumented".
The Catholics are really bad on this issue but it is not just the Catholics. Most of the mainline protestant churches are trying to fill their pews with illegals too. Recently both the Episcopagans and the Lutherans came out in support of massive amnesty (which they euphemistically call immigration reform).
I think that when churches start advocating policies that adversely impact taxpayers it is time to start turning churches into taxpayers. Schools for example are funded largely by property taxes and the cost of education is dramatically increased by illegal immigrants. If the churches want the illegal immigrants so badly why should all the prime real estate where their buildings are located be exempted from the tax base that funds the schools?