Atheist/non-religious give your best personal experience of why you lack belief/faith in a god. PS. This is key...."personal experience", not "lack of scientific evidence".
I was raised without religion, but at age twenty, while in the Army, I met a girl who was a zealous Christian. Being in a relatively bad place in life - I had already failed at university due to lack of discipline, which is why I chose the military, but that life was unpleasant for me, adding to the general malaise of life, and I was far from home, which contributed to my unhappiness even more. So, this girl and her religion were appealing to me, and I dove in. I remember one day, while sitting on the barracks steps with her, the sun shone down in crepuscular rays, and a shiver went down my spine. I was sure the Holy Spirit was telling me that I should marry her, and I did.
I was already somewhat skilled at critical thinking, and the religion didn't make sense to me, but I decided to suspend disbelief to give this God a chance to reveal itself to me and for the dogma to begin to make sense. I likened it to trying on a pair of shoes that didn't fit quite right, but if I walked around in them for awhile, the fit would improve. The two years in that Maryland congregation were euphoric, and that was enough to convince me that I had been filled with the Holy Spirit as promised. Then I was discharged and returned to California, where we had two daughters.
We went to about a half dozen congregations there, finding them all lifeless. Eventually, I realized that what I was interpreting as the Holy Spirit in Maryland was just a psychological state induced by a gifted and charismatic pastor, since that feeling didn't come with me to California. I realized that the religion was not delivering in its promises and was false, so I kicked off that pair of shoes and returned to atheism, where I found better fitting shoes in secular humanism.
But that's not an argument against gods existing, just that one. I'm an atheist because I learned the harm of believing and making decisions by faith. Eventually, without the religion holding us together, we divorced. She was still a believer, and we weren't well matched in any area. I didn't really know her when I had that barracks steps experience. She was bitter about my leaving her and the religion, and has never forgiven me over forty years later. She moved the kids away from me (I wasn't mobile, being back in university) and turned them against me. I still don't have a relationship with either of them.
This is the chief regret in my life. I made a bad decision based in faith and am still paying for it. So, I don't do that any more, and that is why I am an atheist. I don't say that gods don't exist, just that believing in one or more is irrational and, at this point, having learned to accept that the universe may be godless and that there may be no afterlife, and having developed a social structure outside of a religious congregation, adds nothing to my life.
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