Re: If a husband chooses to get a vasectomy, how does it effect the salvation of his wife when she protested his decision?
It doesn't. The bad actions of one person cannot effect the salvation of another. In a situation where the wife did not agree with the husband's decision and even, as you said, protested it means that the sin is the husband's and not the wife's. The wife has done nothing wrong and her salvation is not affected.