yes being a believer or non believer has nothing to do with patriotism.
in fact i do believe that being a believer helps to stick to good morals, helps to over come difficult situations etc.
being agnostic is difficult..biggest threat/ fear i (many ) face is what if i am wrong ? there is also some theory that says " being believer is good because even if you were wrong(about existence of god ) you have nothing to loose and if you were right it's a big gain, on the other hand agnostic or atheists are taking a risk which is not worth because if they were right nothing much to gain and they were wrong hell is waiting for them.
i don't know yaar..i never heard of him turned religious.i am more impressed and interested in his contributions to independence of india and the courage he showed..and such a courageous man will not believe in god out of fear.