So one concept I remember back in the day is the concept of Intelligent Design, the idea that things like Evolution and the Laws of Physics (like Thermodynamics) are reality because there is a force that made them to be (in this case a deity).
A big reason why this explanation for the existence of everything fails is that its proponents advocate it under the impression that because life on Earth is a thing and the Universe as we know it is so "finely tuned" because there must exist a merciful creator that wants us to exist. The thing that is missing from here is that the Creationists that advocate for this theory fail to understand is that most of the Universe is a death void (black holes and pulsars emitting ionizing radiation, many of the planets that we've found so far (including exoplanets) are uninhabitable, and space is filled with deadly cosmic radiation that you wouldn't be able to survive in without a space suit) and most importantly the people that advocate for Intelligent Design decided to start out with a conclusion (everything exists so therefore God must have done it) and end with a hypothesis (does existence rely on an outside intelligent force) which is not how the Scientific Method works. It's the same classic trap that many Creationists make for themselves that is known as the 'God of the Gaps' fallacy where if you don't know the answer to something, therefore it must be God that did it (imagine having the math question One plus One being presented to you on a test and if you don't know the answer then you decide to choose 'God' as an answer to that math question).
Intelligent Design at the time was a crackpot pseudoscientific theory as a response to the fact that public schools in America legally cannot teach any specific religious doctrine (the First Amendment prohibits the state from officially establishing or promoting any kind of religion, hence why there is no 'Church of America') so a lot of religious groups at the time wanted to throw anything at the wall that could stick to justify teaching the Genesis creation narrative in public schools because something like Evolution gets in the way of teaching the narrative that the world was created in seven days in a public classroom setting.
There's also something Intelligent Design has in common with another pseudoscientific theory which is Astrology (the ancestor of Astronomy and Psychology). Astrology is a belief that the heavenly bodies you see in the night sky must be the work of gods and the positions of the planets and the Sun must influence your personality (this is how people in ancient times explained the Universe around them and how they explained human psychology back then). Now we know why much of the Universe is the way it is thanks to objective observations and human psychology is now more easily explained without the need of involving religion. But despite this, there's people who still believe in Astrology because they claim it to be true when really believing that the stars have anything to do with your life choices and personality is entirely dependent on faith.
Now the question remains, what came before the Universe existed? The answer is no one really knows. Could it be a deity that made everything? Maybe, or it could be something else entirely where the explanation doesn't require the presence of a deity (we may never really know for certain anytime soon). But one thing is for sure, you shouldn't believe in something just on blind faith alone and solid concrete evidence must be present to prove that something is true. For something to be objectively true, it always leads back to the 'Pics or it didn't happened' meme.