Does Big Bang Theory Support Kalam Cosmological Argument?

One type of cosmological argument appeals to the idea that the universe began to exist. This argument was originally devised by medieval Muslim theologians William Lane Craig reintroduced their argument from the beginning of the universe as the Kalam cosmological argument. On the basis of the standard big bang model, Craig attempts to support the premise that the universe began to exist. I argue against Craig's view, and defend that the scientific data does not show that the universe began to exist. I support this claim by appealing to the equivocal use of the term universe in physical sciences and in religious or philosophical literature and to the lack of data beyond the Planck era.