You missed the point. No one is setting any limits on God. That's a false assertion. Rather, the Bible states that God has set limits on the beings He created. Created beings are finite.
Now there is no "science" that "proves" a human being can hear millions of prayers a day and then intercede each one of them to God "telepathically."
What you're referring to is parapsychology which is the study of psychic phenomena including extrasensory perception (ESP) among other things. ESP is data received through means other than the customary channels of information.
As stated in 'The Kingdom of the Occult,' in any study of Psi phenomena an important distinction must be made between normal ESP and occult ESP. Scripture, human experience, and occultic influence distinguish these. Here's a chart Christian researchers, including Dr. Walter Martin, created to explain this:
The term normal ESP can be used to describe experiences many people have had such as when a loved one seems to know an accident or even a death has occurred, and when the facts are investigated, this knowledge is found to be correct-without any communication between the parties involved. This is normal ESP, since it occurs commonly in most people.
It's important to note; however, that normal ESP comes without invitation or seeking. In contrast, when people deliberately try to access ESP, they trespass willingly into the world of the occult, attempting to acquire power over an unexplainable phenomenon. Quite often, intentional exploration of paranormal power or experiences opens the heart and mind to the occult.
Normal ESP is the ability to know of an event while it is in process, a telepathic capacity to access information simultaneously present in another person's mind. This normal form of ESP has nothing to do with the occult. It is a latent sense often referred to as a sixth sense or intuition, more developed in some people but most likely present in all. The Bible suggests this function is restored upon physical death; however, the Bible also asserts it's subject to clear finite boundaries which isn't surprising as the Bible asserts the abilities of created beings are finite.
Supernatural knowledge comes from three sources: Holy creator God, a natural spontaneous link to a human mind which sometimes forms, or a link to the mind of an interdimensional being the bible identifies as a demon.
This is a crucial difference that can be determined through research and confrontation (and with respect to the occult conducted in the name and power of Jesus Christ for demons are subject to the name of Jesus; they must obey a directive given to them in His name however reluctantly). Interestingly, this command can be given by nonbelievers, but by doing so they place themselves in a dangerous position, similar to the sons of Sceva in the book of Acts.
Normal ESP will usually manifest itself in telepathy (e.g. the ability to access knowledge of an idea or event while it is in process. This knowledge has no connection whatsoever with the occult or with religion).
Numerous universities, private organizations, and military programs have studied both normal ESP and delved into occult practices such as 'rear viewing' and psychokinesis (the latter resulted in demonic oppression and possession of the principles involved including the military officers participating in 'rear viewing' research).
For example, the experiments of Princeton researcher Dr. Robert Jahn and his Princeton (PEAR) staff appear to support the existence of some type of normal ESP based on lab trials with a key element distinguishing normal ESP from occult ESP being the source of the knowledge.
In no case, whether natural ESP or occult ESP, was anyone in any of these program studies ever able to receive a multitude of communications in parallel. Never.
Even though created beings (e.g. humans, angels, and demons) have the ability to communicate extra-dimensionality, this is finite. No created being has the ability to receive countless millions of petitions and intercede for them to God.
In addition to the teaching being biblically false and the temporary realm of the occult aside (as that's ultimately going to be completely destroyed forever); the existence of normal ESP in this life, the exponential possibilities for ESP outside of this life with respect to finite created beings, and God's ability to communicate with finite created beings in no way equates to the finite created being Mary being able to telepathically receive billions of prayers and then personally intercede for each one of them.
This is true both inside the time dimension of this universe or acting outside of it as a finite created spirit being dependent on what's occurring in the context of the time dimension of this universe.
Your assertion is biblically and scientifically false.
You set limits on god that even science does not regard as limits ( or at least real science, not the rantings of Dawkins)
Telepathy for example is real. The mental connection of people on demand. Demonstrated beyond statistical doubt. For a bit of fun check out the Nolan sisters experiment conducted by the very serious scientist Sheldrake on youtube, an experiment he used to bring a very serious scientific issue into wider public domain. A very serious professor of statistics in the US took all the federal telepathy experimentation data and confirmed the significance is undeniably there in the results. Since a Nolan sister can call out to another across space,why deny this to Mary?
In quantum physics effects precede causes, and no end of paradoxes occur from trying to constrain time as a simple continuum - the best that scientists can come up with as a mind game to dodge such as Schrödinger's cat is the presumption of infinite universes selected on observation, which in reality says the mental grasp of the concept of time by humans is an inadequate model.
Humans impose their own world view on nature, arbitrarily defining the supernatural as things they dislike - particularly Dawkins who refuses for example a serious debate on evidence with Sheldrake because it offends Dawkins world view of life as a biochemical machine, so consciousness confined to region of the nervous system.
The point is you do not know what angels or human souls can do, only the parts revealed in the bible which is not all of truth.