I think that the religious fabric of India is so rich that atheism can only find voice if it interlopes with theism.
You find this a lot in the political/religious melding of many issues leading up to independence.
For instance I recall how India's #2 (and arya samaj advocate ....can't remember his name now) was visiting a temple to take darshan yet he insisted on keeping his shoes on (arya samaj only give credence to the original 4 vedas, so all other corollaries like puranas, pancaratras etc that deal exclusively with the practical application of these 4 vedas ... that include such things as taking shoes off before entering a place of worship .. are neglected). Anyway, the crowd that had gathered to take darshan of the politician taking darshan physically grabbed his legs to prevent him from entering.
Compare this to when the ex-president Clinton (who is not jewish) wore one of those little hats when visiting a synagogue. (he didn't have a requirement to defy the standing custom of the jews, much less wantonly display disrespect for their customs).
In short, you can spot atheism according to the value of its social voice.