If you struggle with the concept of someone kneeling during the national anthem then you are really going to have a hard time with the coming eschaton. Jesus didn't come to unilaterally support the United States of America — he came to save and redeem humanity and the world. Christians are supposed to follow Jesus first, not the United States of America.
Now, before you object, please don't try and bait me with tired excuses because:
A) I love our country.
I am proud to be an American citizen. I grew up with an American flag on the wall of my bedroom. Growing up in a low-income trailer park in northeast Ohio where folks lived pretty simple, that American flag hung on my wall as a constant reminder that I live in a land of opportunity.