95% of immigrants tend to be religious, and overwhelmingly Christian.
And the critical mass of religious folks would create a peer pressure situation which will force folks already here to be religious.
Open Borders is the only solution.
However, younger people are less religious than older folks. Even in Egypt, "only" 71% of young people say religion is important in their lives (older folks are at 78%).
I keep hearing that there is a religion crisis, among increasingly unreligious young folks, in places like Iran.
I even heard that is happening in Palestine.
Arab citizens of Israel have seen births rates drop by miles, and Jewish females now have a higher birth rate. Religious observance might play a major role in the birth decline.
Religion is tied to higher birth rates.
Lower birth rates indicate way less crime, as I just can't see "only child" families being incubators for crime, even in poorer neighborhoods.
The United States now has an all-time low of births per year per female.
The lifetime birth projections per female are about to break the 1976 record (1.74 in 1976, 1.76 now).
I tie religion and birth rates together as a major component of societal health.
(And yes, lower birth rates do help make hard borders a little softer)