To each his own. When it comes to something like prayer, the only evidence that really matters to me is personal expereince. If that makes me closed-minded and you open-minded, then so be it.
Personal experience can be a source of evidence, but it takes rigorous application of control. For example, for a week, every time you pray, write down what you prayed for, and what you would consider to be granting the prayer. For example, if you pray for a relative to be healed, write down what you would consider healing. Write it down before you check out the results. Then, within the specified time period, record how many of your prayers were actually granted. I think you'll find, as have those before you, that any results external to you will be granted at the exact same rate as had you not prayed.
I'm sure you'll agree that if you don't do this, it's not experience, it's just bias.
btw, I am quite willing to do the same experiment. For some time period, I'll pray to any God you like, and then go back and see how it turned out. If anything measurable and external happens at a rate greater than random chance, I will seriously reconsider the existence, power and beneficience of that God. If it doesn't, will you do the same? If not, who's open-minded here, and who isn't?
However, prayer has been shown to be beneficial for the person praying. So is meditation, and it seems likely for comparable reasons.
As long as you view prayer as being about something internal, it is successful and beneficial. It's when you look for results in the world outside of you that it falls down.
As for the apology, let it go; it's no big deal. I'm more concerned about the effect on the issue. But again, for your future reference, effective apologies are not conditional.