Christian argued that everything must have a creator

[Alex K]

@athrock

A careful reading on the Wiki article on "big bang" will do for a start.

Also maybe the article on inflation, not because inflation must be true, but because it provides reasons why the simplest extrapolation to the earliest possible point is unlikely to be viable. The article should also make clear that the numerous correct predictions of bbt do not rely or involve an extrapolation to a singularity, but merely require (and are supported by strong evidence for) a hot dense state.

The important point is also that the extrapolation beyond scales at which we know the laws of physics are speculative, and that general relativity would break down anyways because of quantum gravity before a real mathematical singularity.