That's just standard religious people cherry picking what they like.
If you take out the Christian looney stuff America was a country built on genocide and slavery with certain Europeans profiting off it greatly. Naturally the story they tell themselves, as we do with our own stories, will be things like the "pioneer spirit" and coming through great adversity. The "can do" American spirit is central to their identity and naturally, imo, they'll be a strong element of "well if you're not tough enough then that sounds like a you problem" in their culture.
I agree that you'd think being strongly religious would curb these more selfish instincts (which let's face it is in no way unique to Americans, this is human nature) but as I say, people will cherry pick what they want.
Having said all that how do you know Jesus would be sad? Jesus was a Jew and Trump said the Bible was his second favourite book and is sticking up for poor old Bibi so I imagine Jesus loves America and will come back donning the cap and everything. Big fan of crypto scams and stuff. The church love running those kind of scams as well. And noncing.