Anima Aeterna

So the thought occurred to me that one thing that most monotheistic faiths lack is a sense of the whatever comes before this life.
Of course that comes from the simple fact that as being travelers on this journey we call life,we are far more concerned with where we're going than where we're coming from. However, faiths such as Buddhism, Hinduism, and Mormonism all provide explanations of what has come before. Socrates provided an explanation, as well, as did Vergil in the Aeneid.
I have to wonder, then, why it is that Judaism, Christianity and Islam does not seem to put such emphasis on this facet of our faith.Truly, if we claim that the soul is eternal, per Aquinas, then we have to ask where we came from.
I suppose this is a good opportunity to examine the case for eternality. Does eternality mean an infinite amount of time on both sides? Is eternity more like a geometric line or a ray? Does something eternal have a beginning or has it always existed?
Suppose we say that something is eternal. Therefore, it necessarily has an infinite amount of existence. Thus, it will continue to exist forever and whether or not it was created seems irrelevent because it will always exist. However, if we say it will always exist, this is different than saying it does always exist. If something is created but will never cease to be created once it's created, then we can always measure how long something has been around. On the other hand, if something's existence goes back ad infinitum then we can never say how long it has been around.
What I'm trying to say is this: If everything that is has always existed in some sense, then our souls necessarily have always existed in some sense. But, if we believe that at some point everything was created, then our souls were created as well. Simply because Newtonian laws dictate that everything that is will always be in some form or another does not mean that it always has been.
Here's the conundrum: if our souls have not always been around, how can we be sure that they will always exist? And if they were not created at some point, how can we say that our God is all powerful?
Perhaps this is the reason why monotheism has never addressed this issue. Buddhists have no real concept of an all-powerful God, therefore omnipotence isn't an issue. Hindus have a group of gods that work in concert, but none of them are all powerful either. The gods of the Greeks and Romans were little more than super-powered human beings. And Mormons' concept of divinity rings like a combination of monotheism with the Olympian gods, by which method humans can become gods and God himself is limited in the heavens.
Thus, the idea of our souls existing since forever seems to be absent from those who believe in a god who has all power in the universe.