When Americans describe themselves as "Christian" they are effectively talking about a different religion than the "Christian" in CDU. Americans that do fit into that same bucket use words that describe the so-called "mainline" Christianity like "Catholic" or "Lutheran."

The only thing that modern evangelical churches have in common is they read the same bible and believe Christ was resurrected, but their theology is different, their practices are different, there is no formal clergy or clerical education/scholarship, and their values typically invert from what every other Christian denomination teaches. And there are more cults than you can possibly imagine.