The historic Christian practice of asking our departed brothers and sisters in Christ—the saints—for their intercession has come under attack in the last few hundred years. Though the practice dates to the earliest days of Christianity and is shared by Catholics, Eastern Orthodox, the other Eastern Christians, and even some Anglicans—meaning that all-told it is shared by more than three quarters of the Christians on earth—it still comes under heavy attack from many within the Protestant movement that started in the sixteenth century.
The Bible indicates that the glorified human intellect enjoyed by the saints in heaven has a phenomenal ability to process information, dwarfing anything we are capable of in this life. This is shown by the fact that, on Judgment Day, we will review every act of our lives. But since Judgment Day is not going to take eighty years to review the events of an eighty year life, our intellects will be able to process enormous amounts of information and experience once freed from the confines of this mortal life. And not only will we be aware of the events of our own lives, but of the lives of those around us on Judgment Day as well, for Christ stated that all our acts will be publicly revealed (Luke 12:2–3).
This does not imply that the saints in heaven therefore must be omniscient, as God is, for it is only through God’s willing it that they can communicate with others in heaven or with us.
Your argument Aieno, about petitions arriving in different languages is even further off the mark. Does anyone really think that in heaven the saints are restricted to the King’s English? After all, it is God himself who gives the gift of tongues and the interpretation of tongues. Surely those saints in Revelation understand the prayers they are shown to be offering to God.
The problem here is one of what might be called a primitive or even childish view of heaven. It is certainly not one on which enough intellectual rigor has been exercised.
"An angel came and stood at the altar in heaven with a golden censer; and he was given much incense to mingle with the prayers of all the saints upon the golden altar before the throne; and the smoke of the incense rose with the prayers of the saints from the hand of the angel before God" (Rev. 8:3-4).
A saint's ability to hear a bunch of requests for prayers at once doesn't infer omnipresence. It just means they are outside of time like everyone else in Heaven.
Peace