Why is discriminating against religious people in order to stop discrimination against women okay?

Why should anyone with a religious objection to the way a law applies to them be granted a special exception from it?

This isn't about "religious discrimination." This is about the balance we strike between "free exercise" and a legal system that applies equally to each of us regardless of whether we want it to or not. If it's contraceptive requirements today, who's to say it won't be zoning laws, employment discrimination laws, workplace safety laws, etc., tomorrow?