Will I b receiving anti religious comments from French people (bcs headscarf)?

You'll have a wonderful time. I've stayed in Montmartre a couple of times, near the shops which sell textiles, and the area was full of all sorts - tourists like me, French, African, Asian. You name it, we were there, all shapes, sizes and colours. If you go anywhere as an obvious tourist (ie not a native French speaker) you will be treated as one - what else? Life is an exploratory journey - enjoy it all, even the rude people you might meet occasionally.