It's universal in the sense of all nations (not just one tribe or nation or kingdom, like Israel).

It does not mean we "open the door" to unrepentant adulterers or homosexuals, or heretics and infidels. Like the rest of us, they need to repent, or face hell.

"Maturing in the Catholic Faith" does not mean permissiveness, but involves perseverence and holding onto the Faith once delivered to the saints (see Jude). It's NOT embracing Eastern paganism.