Because huge numbers of people who helped make the third world the THIRD WORLD want to pack up and bring their problems here, to the United States.
Race is immaterial, except to race baiters like you.
As opposed to immigration from white Europeans or Canadians?
Last time I checked Canada and European were part of Western Civilization. These are relatively free, stable, wealthy countries. Which means their citizens are less likely to go on the dole, or attempt to take advantage of race-based policies like affirmative action.
Why is that Pat finds it alarming that America may not be a majority white country in the future?
The race factor wouldn't matter if there were no such thing as a welfare state, affirmative action and multiculturalism. These institutions didn't exist during previous waves of American immigration, a factor most of the people who take your position choose to ignore.
Why does Pat associate the religion of Christianity with Europe when Christianity is practiced worldwide?
Do you have a quote to back this up? To my knowledge Pat Buchanan has never said Christianity is not practiced worldwide.
Why does Pat not like Catholic and Evangelical immigration from Asian countries that persecute Christians?
It's called being consistent and intellectually honest. IOW, opposing these immigrants is a necessary part of his an overall (non-racial) argument against immigration.
Many Asiatic countries are hell holes (do you disagree?), and many of those immigrants would bring more with them than Christianity, whether you will admit to it or not.
Which means their citizens are less likely to go on the dole
Please. The residents of these countries are already on the dole - you might have heard of socialized medicine.
To my knowledge Pat Buchanan has never said Christianity is not practiced worldwide.
In an interview for Pravda - Pat made the following claims: He claims the Europe is the Faith and the Faith is Europe. He goes on to say that "they" (i.e. the brown-skinned people) won't practice our faith or respect our culture. You can look it up on FR.