Re: are they muslim?
We Muslims can't EVER unite with Jews, Christians, Hindus, Majooos and those Munafiqeen who call themselves Muslims and who are Quran rejectors and Haters of Companions and Ahl-al-Bayt of Muhammad sallAllahu 'alayhe wasallam.
If some people want to unite with us then the Unity would be upon Quran only which has reached us through Companions of Muhammad sallAllahu 'alayhe wasallam (Sahabah). Those who curse and slander Abu Bakr, 'Umar, 'Uthman, Mu'awiyah radhiyAllahu 'anhum and Azwaj-e-Mutahhiraat (Mothers of Believers) are Hell Bound Kuffar.