Muslims are Muslims and I guess they will always be Muslims.
Sincere, good people write to them about Islam out of the goodness of their heart and Muslims don't even bother to reply or write back. Even though answering a Muslim's Salaam is a requirement -- Waajib as some people would call it.
Those then are your people: the Muslims.
But make no mistake, these are the people you will have to work with, for as long as you live -- such as they are and such as you are.
That is, when you are not working, day and night, with Non-Muslims, trying desperately to reach out to them and invite them to Allah and to Islam and to Qur'an and to Muhammad, Sallallahu Alaihi wa Sallam.
Those who do this, and never tire of doing this, I mean this business of reaching out to both Muslims and non-Muslims, in the face of all the rejection and cold treatment they get, the Qur'an is quite vocal about them.
The Qur'an says:
Ulaa-ika Humul Muflihoon!
"They are the winners."