How do you believe the “everything” began?

Hi all. To preface: from a young age, I was indoctrinated in the Baptist “faith”. In the last few years, I’ve started listening to myself and embracing the fact that I do not believe in Jesus (I know that there was a man named Jesus, but I do not believe he was the “savior of the world”. I don’t believe in God in the way I was raised to. I tend to gravitate more towards a belief of Mother Nature being our guiding force, which led me here. I also have full faith in science and biology. As im very early into exploring what I actually believe instead of what I was told to believe, im trying to figure things out. One of the things that causes me pause is, how was all of “this” created? I just wanted to get some opinions and thoughts from like minded people, and from what I’ve researched so far-you all seem to be. Any thoughts, or guidance?