GRRRR!
It was NOT the use of a Virgin Birth! That is complete fan-spread nonsense.
Anakin's birth at the hands of a supernatural Force is in keeping with ancient mythology of chosen ones and is nothing to do woith Christianity at all. It's a Greco-Roman thing.
And he hasn't 'used' Indian religion. He borrows from mythologies like he does all over. What he doesn't do is rip off what they say verbatim and stick it in his films.