What is the "Poor In Spirit"?

Let's Look A Little Deeper...

As I was going through and surfing the web, this posting caught my eye.  Although, this cartoon appears to be going for an audience for entertainment purposes.  I have bypassed the joke and decided to look deeper. Therefore, enclosed is the video of more of an explanation. 

#TrumpCouldBeAGoodGuyIf He'd stop hiding behind the phony Christian act and admit he's the Anti-Christ... pic.twitter.com/cnRNKrqnIz

— JH Hawkwood (@HawkwoodJh) February 27, 2020