No. Only God is omniscient, and this, unlike some of His other qualities, cannot be shared. Some Protestants, like one I recently talked to via text, said that in order for Saints to hear our prayers, they must be omniscient. This doesn't follow. Since prayers aren't all that make up truth in the world, and omniscient is knowledge of all that makes up truth, omniscience isn't necessary. Add to this the fact that prayers are finite, even if numerous, Saints can still be aware of all our prayers without being omniscient. This same Protestant also argued that since prayers come from everywhere in the world, they must also be omnipresent. For the same reasons as before, this also doesn't follow. I didn't think to bring it up at the time, but 1 Peter 5:8 reads, Be sober, be watchful. Your adversary the devil prowls around like a roaring lion, seeking some one to devour. This was written for all Christians at all times at every place. And surely, the devil can temp...