Well these are the things which would need to be discussed. Posters above spoke in the American context of people being wed where one of them was already married. I think the poster mentioned that both marriages took part in the same state.
I gave a likely scenario of the state allowing multiple marriages in accordance with Islam and pointed to the breakdown of secular marriage which might then follow. The way things are going people will be pushing for their right to be in multiple marriages. If this happens then no one can cast iron guarantee you what you like.
If you look at the Muslim community today in the west there are multiple marriages. The first is registered by the state and the others are religious marriages not registered. No one can guarantee that the man you marry has not had a Muslim religious wedding and already has 2 other wives. This thing has happened before. There have even been cases where a bride marries a man and then travels to Iran to discover she is wife number 3.
What I have suggested above is that we should explore these changing times to see how we can deal with such situations.
If secular marriage continues to be loosened then the state will be in even a weaker position to give you your guarantee.
These are exactly the issues that can be discussed here. If we don’t and secular marriage disintegrates and is completely unrecognisable then we will find ourselves in a position of wishing we had.
Similarly if the improper conflation between secular and religious marriage continues then there are people who would wish to control the church in some ways through secular law of this overlapping of ‘marriages’.
We have to be prepared for changing times because as Mr Dylan once said, they certainly are.