You may be right, and you may have even been able to get your opposition to admit that you have a valid point, but don't expect them to suddenly see their house of cards faith crash down right before their eyes. Simply put, long-held beliefs don't work like that, at least not usually. Let me illustrate through a non-faith related example:
I remember an engineering issue I had become familiar with; a certain component broke earlier than its expected lifetime. I had considered the possible causes, and developed a theory of what the failure mechanism was. About two years later, I had a chance to actually see the mechanism of failure in action, but there was one problem:
It didn't fail in accordance with my theory!
It took about two days for me to fully come to terms with the fact that I was wrong. In the meantime, my mind worked to provide all kinds of alternate explanations of how my original theory was still true, but, in the end, I had to face facts.
The engineering example above is a pretty simple scenario. I had nothing more invested in my wrong theory than my own ego. Yet there was still a futile struggle in my mind to reject what I had learned.
Compare that to all of the complexity of religion, where there is considerable investment of finances, effort, and hope, and it should not be surprising that you will not find any converts at a debate!
The best you can hope for is to plant a seed of discomfort in your opponent's mind... a discomfort which is enough for them to consider what you've said beyond time of the debate. Then, kind of like in Jesus' seed sowing parable (Matthew 13:1-9, Mark 4:1-9, Luke 8:4-8), if that seed lands in fertile soil, in a mind which wants to know more than wants to believe, your loss may yet yield a victory in time.