As someone who traveled to India before with identifiable Jews (I'm secular myself). Me and fellow travelers in my party have found Bangalore to not be risky for Jews. I've also talked to several travelers since and they confirmed this.
A more official source is the Israeli government's anti-terror office which issues travel warnings in Israel. It's in Hebrew but you can look at the map and see there are only travel warnings in Kashmir in India at the moment (I think Kashmir is a little marginal, and a little dangerous for Jewish travelers in my opinion based on anecdotal experience).
In fact, India is a very popular travel destination in Israel and many Israelis visit there at least once in their life.
That said, you should be careful in India and also read about the cultural differences between the western and Indian culture. It's a beautiful place with many kind people but I recommend reading about it and trying to understand the culture in India and south India in particular.
Bangalore itself is huge and if you stick to the "good parts" you'll be just fine - just be prepared for the cultural shock since India is very different from Israel or Canada.