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Honestly, I think this is the first time someone here has been kicked out of a church where I actually sympathise more with the church than the person getting booted.
Many of us have been kicked out of churches simply because of our theological views differing from the mainstream. That is unfair and unreasonable, for many reasons.
But you on the other hand were NOT kicked out for your differing theological viewpoint. Your church was unusually accommodating, only telling you not to try and promote your views there and stopping you from having any official roles, but permitting you to continue to attend. This was so generous that you yourself called this discussion "making progress on the church acceptance front" - this was not going in the direction of rejection, but rather acceptance.
You have now been kicked out NOT for believing in polygamy, but rather for making unwelcome advances to a young lady who found your advances creepy enough that she complained to the church leadership. Note that this won't be just over one email, the fact that she refused to give you her phone number in the first place (which is NOT normal) showed she was already uncomfortable about you. The email will have been the last straw, not the sole problem. Honestly, if there was a man who was approaching the ladies at ANY church - even a polygamous one - in a way that made them feel uncomfortable, they could expect to be told to leave. Just as you have been now. If someone was making the ladies uncomfortable even at a BF retreat they'd probably be told not to come back. This is the normal, understandable reaction of ANY church leader, and is motivated solely by concern for the women in their congregation.
It was very obvious right from the start of you talking about this young lady that she was not keen on you contacting her and that this was a likely outcome, which is exactly why most of us have been discouraging you rather than encouraging you:
We are not trying to boost your confidence, because you already seem to have more than enough. And because in this case the consequences of over-confidence are much more serious. We want to help you find the right woman at the right time. Not give you the over-confidence to hit on church ladies until you and your wife are kicked out of all fellowship.
I am most sorry for your wife. You might have been expecting to be booted from this church eventually, so have been happy to push the envelope until that occurred. You may have even at some level deliberately pushed it to this point to achieve martyrdom. But I highly doubt she is happy about the result, and I fear you have done this without taking sufficient account of her feelings and need for fellowship.
You are not a martyr who has been mistreated and booted from a church over polygamy. You were treated unusually generously by your church, yet chose not to appreciate that generosity, but rather to take advantage of it by making advances on a woman in that congregation.
You have entirely brought this upon yourself.
Furthermore, you have made life MORE DIFFICULT for anybody else who believes in polygamy. The leadership at your old church will now think they know, from experience, that if they allow somebody who believes in polygamy to remain in their fellowship they will end up a potential danger to the ladies. You have confirmed for those church leaders that they were right to oppose polygamy. Any future person in that congregation who starts to think polygamy is ok will get the boot much faster as a direct result of your idiocy, to pre-emptively protect the ladies. You have in your own small way made life slightly more difficult for us all.
I have no sympathy for you at all, but enormous sympathy for your long-suffering wife.
It's high time for you to start learning wisdom.