Exactly, how do saints in heaven hear our prayers? Are they omniscient and omnipresent? Can one popular saint, for example Padre Pio, hear millions of prayers at the same time? If so, he would be God.I'm not exactly sure how the saints are able to hear all of our prayers, I just know that they can. It could be for a variety of reasons, and I go over a few of them here. But, ultimately, I think that how they are able to hear are prayers is not as important as the fact that they can.
I realize that, for someone who is questioning this doctrine, the "how" is very important. Often times, it's difficult for us to believe something if we don't fully understand it first. But, once understanding takes us as far as it can go, we must leave the rest up to faith. The Church teaches that we can pray to the saints, and has encouraged it since ancient times. That alone should suffice. If that weren't enough, the Bible shows that the saints in heaven are aware of our prayers, and praying to the saints is a perfectly logical thing to do, considering the syllogism that I provided in my previous post, and the absense of anything in Scripture that speaks against it.
As for whether or not saints become God once we attribute to them the ability to hear our prayers, I would say, first of all, that God is much more than his omniscience (his "all-knowing") and his omnipresence (his presence everywhere). Even if the saints did have these characteristics, perhaps b/c of their profound union with Christ, this would not then make them God. For example, they don't suddenly become the First Cause of all things and the Unmoved Mover just b/c they are aware of all of our prayers. Plus, I don't even think it's necessary that they know all things or be present in every place in order to hear our prayers. Really, all that seems to be required is that they be united to Christ, and in a place where prayers ascend like incense (cf. Psa 141:2; Rev 5:8; 8:3-4).
I can ask my friend in England where I live to pray for me as I prepare for an exam. I can ask you in America to do the same, through the internet. But someone in Sydney, Australia who does not know me, cannot hear my request or know I am preparing for an exam can only make a general prayer "for anyone sitting an exam" because they are not omnipresent or omniscient.Well, I hope what I've said here helps a little. The earlier blog post I linked to may also help, since it provides a few explanations for how it could be that the saints are able to hear our prayers.
Your Biblical references (1 Cor 9 and Heb 1: 13, specifically refer to angels, not the saints in heaven.)Yes, but angels are saints. All of the inhabitants of heaven, the angels and the souls of the righteous, are called saints. They are all spirits without a body standing before the Face of God. There's no reason to believe that the saints would not be just as able to hear our prayers as the angels are.