That's not quite correct. In supplement to my recent answer to this, I would note that I chose my words very carefully, as any good blood-sucking lawyer would do. :) I said that we all pray "about" things we are sure of. I didn't say we pray "for" those things. My point was to illustrate that prayer is much more than supplication.
It doesn't matter, to pray means to solicit, beseech, supplicate...when we pray we pray because we want something, even if it is simply to be heard or acknowledged.
My objection was why pray if you believe God has predetermined everything and all. If you are predestined to hell, no prayer will help you avoid it. If you are destined to heaven, no prayer will change that either. And since you are certain of your resurrection and salvation, aren't you just making mindless repetitions with prayers?
So, why not just say "Thy will be done" and be done with praying, FK? No need to repeat it as if God didn't hear you the first time; as if He needs to hear you! He knows what you feel in your heart, so why don't the Refromed just go about their lives and not bother God with prayers? The end result is the same.