There are unmistakable characteristics that define some nationalties, such as language etc. I strive each day that my character and conduct are unmistakably recognisable of a Citizen of Heaven, in waiting.

The Lord is good to all,
And His mercies are over all His works.
All Your works shall give thanks to You, O Lord,
And Your godly ones shall bless You.
They shall speak of the glory of Your kingdom
And talk of Your power;
To make known to the sons of men Your mighty acts
And the glory of the majesty of Your kingdom.
— Psalm 145:9-12