Craig's Argument for an Infinite Past

An infinite past is not impossible because it allows things like infinite hotels to exist that are impossible. An endless future only has a potentially infinite number of events, while a beginningless past has an actual infinite number of past events. Craig also uses infinite libraries and infinite collections of baseball cards, but they all make the same point. Actual infinites are contradictory, so they can't exist in the real world. Even if you can prove the past must have a beginning, that same argument could be used to show the future must have an end - which isn't good for Christians who believe heaven will be an endless existence with God.