If atheists are so positive that there is no God, where is their proof that He does not exist?

Read also:

• My religion teacher said that there are no atheists because in order to reject God, you must first have a concept of God, and if you have a concept of God, you are not an atheist. In what way is this true, if at all? Why?
• What are the common formulas for improvising ornaments in bel canto singing?
• What do you think about Vivian Jenna Wilson's decision to speak out against her father, Elon Musk, in a public interview with NBC News?
• How can I help my cat adjust to sleeping in its own room after allowing it to sleep with us as a kitten?
• Nintendo Switch 2 owners urged not to skip crucial step setting up their new consoles - GAMINGbible
• Campbell’s Snack Business Struggles as Consumers Get Pickier About Food Spending - WSJ
• What are the signs that a guy wants to marry you but is afraid of commitment or does not want to get married at all?
• What baseball stories from the early days of the sport seem too bizarre to be true?
• Isn't it ironic people always talk about how much women hate Donald Trump, when almost any of them would marry him if they could? What he said in the 2005 Billy Bush video, almost every woman would share the sentiment if it got them his lifestyle.
• Researchers are starting to untangle the links between cognitive processes, emotion regulation, and depression - PsyPost
• What do all Indian parents have in common?