Christian argued that everything must have a creator

[Alex K]

The big bang theory as it is understood by cosmologists today, most emphatically, does not state that the universe began in a single point marking the beginning of time or any such thing.

It posits that the universe was very dense and hot, with a certain structure to its flictuations. That is sufficient to explain the creation of matter and subsequent evolution. Anything beyond that is speculation. A nontrivial mechanism such as inflation is required in the early phase in order to explain flatness  homogeneity and the roughly scale invariant perturbation spectrum. What happens before inflation and how it gets started, is even more speculative.

After reading the salient points of the Wiki article, let me ask: Are you then saying that the universe did not begin from "nothing" but from a very hot, very dense "something"?

I would say

1. we can say with very high degree of certainty that the universe was once very hot and dense about 13.7 billion years ago and we have a very good grasp on its expansion history ever since

2. Before that, it probably underwent inflation or something equivalent, but the details are foggy because of lack of data and much theory work to do

3. What came before is unclear and speculation. We cannot talk about it with any degree of certainty

4. The notion of time and space coming from *** is semantic nonsense.
4b. Our naive notion of a linear continuous time probably breaks down here, and with them naive intuitions about causality.

I am not saying anything definite about where it came from, because I cannot say anything secure about it.