No one has proven P1 to be true in all frames. We're not even sure that time began. We don't know if P2 is actually true (in fact, there is growing suspicion t

No one has proven P1 to be true in all frames. We're not even sure that time began. We don't know if P2 is actually true (in fact, there is growing suspicion that the big bang was merely the beginning of the current phase of our universe). Also, your P4 contradicts your P1, and the rest is speculation.