Many people have heard of the cosmological argument by now, as it is a very popular apologetic that attempts to establish a synthetic proposition as fact without any evidential basis for doing so. However, most people I have talked to don't realize that it is actually worse than that. It posits a privileged inertial frame of reference, violating special relativity, and the entire concept of a block universe based on spacetime. The entire argument hinges on the A-theory of time, as in the B-theory of time the universe never "begins to exist" at all, and it exists tenselessly as a four-dimensional space-time block that is finitely extended into the past. In the tenseless B-theory of time, the universe never "began to exist" making the first premise entirely incoherent. So, how can we determine which theory of time is actually real? Physics, of course!
All that is necessary to show that a tenseless view of time is accurate, and the tensed view of time inaccurate, is the removal of subjective observers from the equations. Special relativity does this. It proves beyond all shadow of a doubt that speed and time are dependent on the position and relative speed of the observer, rendering all inertial frames of reference as wholly subjective. There is not a single absolute or privileged inertial frame of reference. How can we be sure that special relativity is accurate? Well, length contraction and time dilation.
What does all this mean?
The universe is seen as multi-dimensional object that tenselessly exists and doesn't ever 'come into being', so cause is meaningless.
Without a preferred subjective reference frame, relative to the observer, for identifying a simultaneous moment which would be called 'now' one has to conclude that 'now' is meaningless.
I will end this with a quote by the popular apologist William Lane Craig:
"From start to finish, the kalam cosmological argument is predicated upon the A-Theory of time. On a B-Theory of time, the universe does not in fact come into being or become actual at the Big Bang; it just exists tenselessly as a four-dimensional space-time block that is finitely extended in the earlier than direction. If time is tenseless, then the universe never really comes into being, and, therefore, the quest for a cause of its coming into being is misconceived." - Blackwell Companion to Natural Theology pp 183-184
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