Under your assumptions, countries like the US would be entirely white and Protestant, and asylum seekers would never be allowed to enter.
Neither would be a great thing.
Neither would be a great thing.
From my reading, you're the one assuming that white protestants are going to do better in these tests and that is racist etc.
Also, like most people, I differentiate between immigration and asylum. Asylum is like taking your neighbor in after their house burns down. Immigration is like inviting them to stay as a roommate. There are very few people I wouldn't extend a helping hand to, but not a lot who I'd want to live with.