Romans 14:19
So then, let us pursue what leads to peace and to mutual edification.
Romans 12:18
If possible, so far as it depends on you, live peaceably with all.

My two favorite verses. :) Paul, who also wrote the book of Revelations, would almost certainly not pledge allegiance to any nation. Sorry if you've had bad experiences with Christian's in the past. "For all have sinned and fall short of the glory of God," but some of us are trying to be more consistent in our world view.

A really enjoyable podcast about the Christian view of the state is Anarchochristian podcast. I recommend it to christians that worship the state and non-chriatians that want to debate state-christians on their own ground. He's on steem as well at @anarchoxp I believe.