Is India's secularism under threat?

I generally avoid writing blogs on political topics but its getting more and more difficult to ignore the fast changing socio-political situation in India. A major red alert for me recently was when a very good school friend of mine asked me if I automatically form a negative opinion of a person if s/he has a Muslim name! In the 20+ years I have known him, we have never mentioned anything remotely close to religion in our discussions, but now something had surely changed quite dramatically. He too stays away from such controversial topics, but was now quite frustrated due to being turned away by many apartment owners in Bangalore. I can understand vegetarian flat owners turning away non-vegetarian tenants, but my friend's experience had nothing to do with food preferences. It was primarily driven by religious biases.