I wrote are you Englishmen? can this be accepted??
I agree that your answer should be accepted.
Does "Englishmen" mean that you are talking just to "men" (for example at the business meeting) or is expression widely used for all people from England?
I think it is normally for men and many dictionaries define it that way.
Merriem Webster English Language Learners Definition of Englishman
: an English man
male native or inhabitant of England, or a man of English descent.