Answer:
(Fatwa: 1381/1129=D/1430)
Greeting with Assalamu Alaikum is sunnah, it is bad to be habitual of greeting with any other form of greeting. Saying only ?salam? is not bid?ah (innovation) rather it is against sunnah.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
