In any event, in the US and in Northern Europe, you absorb the cultural morays if you want to get ahead.
This may well be true in many cases but there are exceptions. Canada (if one ignores the current, embarrassing secular charter bill in Quebec) has a different philosophy, an official policy of multiculturalism. Britain is also a bit different.
And in terms of northern Europe here in the Netherlands for example, as well as in parts of Germany and Switzerland there are significant pockets of Catholicism. Exclusively Protestant countries are rather rare, actually- perhaps Scandinavia etc.
Home to about eight per cent of the world's 1.2 billion Catholics - more of the faithful than any country outside Brazil - Mexico has seen a slow but steady decline in people who self-identify with the faith. Currently about 82.7 per cent of Mexicans consider themselves Catholic, down from 88 per cent in 2000 and 96 per cent in 1970. Evangelical protestant denominations are believed responsible for much of the drop.
This is of course true but Catholicism is still a huge force, on the cultural level too. Latinos in diaspora tend to have a stronger link with their Catholic faith than those at home, as is the case with many cultural and ethic minorities. It will be a long time before Protestantism takes over in SA, but it is possible.
As it mentions, though, it is the Evangelical branches of Protestantism that are growing, so as I stated above people conditioned by those schools of religion are very unlikely to be interested in Buddhism anyways.