When God separated the heavens and the earth at the beginning of creation, He did not give up authority over the earth while keeping it in heaven.
No, He remains Lord over heaven AND earth (Acts 17:24).
So EVERYTHING on earth -- including presidents, congresses, large corporations, small businesses, school systems, media groups, entertainment organizations, social clubs, etc. -- comes under His authority.
And He calls His people to manifest His lordship in all these areas.
So there's no reason for hesitancy in applying your faith wherever God has you.
As one great statesman and theologian put it...
'There is not a square inch in the whole domain of our human existence over which Christ, who is Sovereign over all, does not cry, Mine!'