Regardless of any "intellectual" spin on things, a muslim cannot marry a hindu, period. It will not be a marriage, but simply conjugal partners who have perfomed a ceremony which is not marriage.
I never said such marriage is allowed in Islam. But that doesnt make it unsucessful. I know people who are happily married like that. Yes it's not a valid Islamic marriage, but it's still marriage.
I really don't see why others have issues with what SRK does with his life or anyone for that matter. If he's commiting zina or whatever, thats between him and God. No one else should be judging him.