so you are having muslim gf mean Muslim are being treated equally
Yea shah rukh khan and Gauri marriage is not valid and marriage of you and your gf will also not be valid as per Islamic laws(fatwa no 0001)
It might be valid according to civil laws
There are many of your brothers in india who claim that india belong to Hindu and they or constitution of india define hindu as someone who belong to religion originated in land called india ( i.e Hinduism, Jainism, Buddhism or Sikhism) if India belong to hindu then muslim become outsiders