“Mass deportations” are not needed. Build a wall, enforce the law, everything else will take care of itself. And he shifted from the probably unconstitutional “Muslim ban” to “specified countries with terrorism problems” in his big speech a couple of weeks ago.
There’s nothing unconstitutional about a Muslim ban.
“No religious test” refers to public office, not to non-citizens crossing the border.
Congress should find that Islam is not a religion.