1. In order for the Kalam Cosmological argument to be valid, it must deny that the universe has an eternal cause. If it does not deny this then the argument can be refuted by positing that the universe was caused by an event in a prior eternal, or timeless state. There is no evidential reason to make this assumption therefore it must be assumed as a logical impossibility.
2. In order for the Kalam Cosmological argument to be valid, it must assume that something springing into existence from nothing without cause is logically impossible. If this assumption is not made then the argument fails because it could simply be refuted by positing a universe which sprang into existence from nothing without cause.
3. In order for these assumptions to be consistent then God can neither be eternal, nor have sprung into existence from nothing without cause. If these assumptions can be invalidated in the special case of God then there is no reason why the opponent cannot claim that the assumptions are invalid for the universe.
4. The Kalam Cosmological argument is invalid if it doesn’t assume point’s 1 & 2, but it is invalid if it does assume them. Therefore it fails on it’s own terms.
Try harder next time…