Welcome, hereiam! Wow, you don't do things by half-measures, do you? I understand your quandry, since my family too is ultra-strong "truth-wise" and the urge to please them or at least, not lose them through shunning, is extremely difficult. Your situation is made even more of a struggle by the fact that you're pregnant (congrats on that--exciting!) and that's a time when, more than anything, you want your mom, sisters, etc. It sounds like you've got a good husband, who's also had his eyes opened, and that's a bonus.
My suggestion is to get good medical assistance. There are various anti-depressants that are safe for pregnant women (I know this first hand) and you probably should talk to your doctor about getting a prescription. I say that because losing your faith is a catastrophic emotional experience and some of us have needed both therapy and meds to get us over the hump. There's no shame in that--you've been traumatized through no fault of your own. As well, being preggers, your hormones are doing the samba and likely exacerbating the depression. You don't want to run the risk of adding to the trauma by incurring post-partum depression on top of everything else (I had ppd following my first pregnancy and it's no fun). So, speak to your doctor or other medical professional (you might want to track down a good psychologist) and see what can be done
You are among friends who care, who've been through what you're going through. Please keep us up to date as things progress...