On what are you basing your conviction? (This is the problem… you can either justify your position or you cannot.) Your choices are to justify your conviction, which you cannot do, or avoid the request to offer evidence. You are asserting what you believe to be true about the world around you.
Imagine this in another realm. I am convinced Biden is an idiot. (Did you hear the Biden supporters scream? “What. You like Trump!’ What’s your evidence.” “Why don’t you like Biden.” ) Now you can hate Biden, Trump, or anyone you like but when you make the claim that you believe ‘X is an idiot.’ you are in fact, asserting something about the state of affairs in the world ‘as you believe them to be.’ You can defend your position or walk away from the debate. Those are your choices. Walking away is cause for the other person to chalk up a win for their side. Obviously, you are stupid and your opinion does not matter because you could not defend it.
This is true of any belief you are convinced of, and opt to share. I am convinced Fords are great cars. I am convinced the carnivore diet is the best diet out there. As long as you keep the belief to yourself, you are correct. You don’t need to justify it. You also just don’t need to justify it at all. But no one is going to take anything you say seriously if you don’t justify it. You’re just shooting off your mouth and that is easy to ignore. (reminds me of a rat I know).
I don’t believe in god or gods. For all intents and purposes, I am at least 99% confident that I have no good reason to believe in God or gods. Hold a gun to my head and I might change my mind. LOL
You are in an extremely weak position if you try to defend the assertion. “There is no evidence?” “Black swan fallacy. The fact that you have not seen the evidence does not mean the evidence does not exist.” “Evil in the world?” “Obviously, God is testing. All evil is due to man’s disobedience.” It does not matter where you wiggle, the apologists have a response.
This is why, when someone asserts that a god exists, we ask them how they know, which god, and to define the god they are talking about. The god concept is not defensible. The more information they give you, the more you can hold against them. (The reverse is true when you argue against a god.)
Okay, with that said, arguing against a specific version of a god is much easier. I believe that god does not exist and here is why. For example: A god that is both just and merciful does not exist. Mercy is the suspension of justice. The god can be merciful or just, but not both. A god that exists beyond time and space is a silly idea. Existence is temporal. A god that exists for no time and in no space is nonexistent. I certainly believe some gods don’t exist.
Now there is another set of gods that the deists propose. A creator god that creates and then vanishes to leave us on our own. There is no evidence for or against such a god. Everyone agrees. My assertion is, 1. I have no reason to believe in such a thing. 2. As it has no influence on the world and has produced no evidence, it is exactly like a nonexistent god. A deist god and a nonexistent god are the same thing. 3. How did the deist come to know the unknowable?
Okay, it’s late and I am tired and rambling. Hopefully, there is some sense in this. The stronger position is to always ask the theists which god they are talking about and why they believe in that god. It is not the job of the atheist to go about the world debunking all the various god claims. The burden of proof for such claims is on the believers. The burden of proof rests on the person making a claim.