Yes, it is Jehovah's Witnesses

Robert M. Bowman has written:

'Jehovah's Witnesses' -- subject(s): Controversial literature, Jehovah's Witnesses

'Why you should believe in the Trinity' -- subject(s): Controversial literature, Jehovah's Witnesses, Trinity

'Understanding Jehovah's Witnesses' -- subject(s): Bible, Criticism, interpretation, Doctrines, History, Jehovah's Witnesses

Jehovah's Witnesses have not 'trembled' at the clergy of Christendom; neither have we 'trembled' at the most powerful governments. After all, we are Jehovah's own witnesses, and we have 'trembled' only before Jehovah God.

(There you have the word 'trembled' 3 times.)

Yes. Jehovah' s Witnesses are generally considered a Christian denomination and are classified as such by most authorities.

Jehovah's witnesses don't have flag but they have a logo.