Unfortunately, Europe serves as a constant reminder of why we are still a ways off from having the infrastructure to accommodate radical merging of cultures. One only needs to Google "Van/Car/Bus/Knife/RAPE/Machete/Bomb/Suicide attack in Germany/France/Britain/etc." to see the results of forced "open society."
Personally, I am not religious. But I do not imagine that it is in any way "preferable" to current (not perfect, but livable) status quo, to import millions of people, 42% of whom practice and preach Shariah law (shaming and banning of women, women better cover up or else) who were on Obama's "worst terrorist nations" list, when we are at the brink of solving world hunger via AI and manufacturing tech developed by us and our allies, we can feed the entire world before sacrificing "the few" for "the many"