Read other letters about this article
Couldn't this be treated with education about Vitamin D supplements?
I'm guessing that, due to a lot of sunlight and many houses being built with inner courtyards where the women can go uncovered outdoors without fear of being seen by unrelated men, rickets isn't a common problem in the Middle East and North Africa. But when people from those countries come to, say, Vancouver, the women don't get as much sunlight and develop Vitamin D deficiencies.
You'd probably have better luck convincing them to take vitamins than to disobey what they consider to be the requirements of their religion--however silly you think those requirements are.