I agree that a person's understanding of the order of events surrounding Christ's return does not determine their salvation. The problem is when a person is continually presented with Scriptural truth and continues to deny - not because of a lack of understanding, but because they do not want to know and see the truth, they hate the truth, and refuse to see the truth.
If someone who is truly saved is mislead at some point as to Christ's return it doesn't affect their salvation but it does rob them of the "blessed hope" that Christ tells us that those of us who know Him as Savior have in the promise of the harpazo. I believe that those people can be shown through Scripture that they, like Christ says, are not appointed to His wrath and will be, like Christ says, removed from the time of the Tribulation. Sometimes the belief in the error of a post-Tribulation Rapture comes from a genuine emotional conviction that it would be unfair for the modern Church to escape to heaven scot free to escape the martyrdom that other believers have experienced. And while it is easy to understand such an emotion, it would be wrong to deny the doctrine of the pretribulation Rapture on this basis alone. The reality is that while many Christians have endured tremendous persecutions and tribulations, untold millions of believers have lived out their lives in times of peace. Furthermore, all of those Christians who died in either peace or persecution throughout history have already escaped the Great Tribulation.
I really believe that for many of those who are in Christ, prayer and consistent Biblical teaching will bring them to the understanding that they will not go through the time that Jesus has set aside for this evil, Christ-rejecting world and that they do have that "blessed hope" that Jesus has given us.
I especially appreciate the Scripture from Luke 17 you posted and the fact you pointed out that that cannot describe anything other than a pre-Tribulation Rapture. And pointing out that the trumpet is akin to the ancient Jewish wedding is wonderful too. I have seen the comparison between the old Jewish wedding traditions and the Rapture of the church. The similarities are uncanny.
Thank you again for your excellent post. And, rest assured from Jesus Himself, His bride will not go through the Tribulation.
Even more interesting is this. If we put the Rapture of believers in context as The Bride and by the customs Christ spoke of the customary celebration period last seven days. That bring us back to the wedding parable Christ spoke of. As five Brides were ready and taken to the wedding and five were not.
This sit goes into pretty good details the wedding celebrations and reading it along with the parables enhances what the related parables meant. The Jewish Wedding Guide Christ spoke of the wedding and I believe many Christians miss a lot of meaning by not having some understanding of the customs He spoke of.