When you ask an atheist why they are an atheist, it’s not uncommon for them to respond, “Because there is no good evidence that God exists.” If that is their only justification for atheism, they have made a gross logical blunder.
In the case of genuine dichotomies (such as God’s existence: God exists, or God does not exist), the lack of evidence for A is neither evidence against A, nor evidence for B. In order to conclude that A is true or B is true, one must have positive evidence for the truth value of A or B. The absence of evidence for both A and B simply means that we must suspend judgment.
Applied to the debate over God’s existence, even if one wants to argue that there is no good evidence for theism, it does not follow that theism is false, and it certainly does not follow that atheism is true. To conclude that theism is false one must present positive arguments against theism. Likewise, to conclude that atheism is true, one must present positive arguments for atheism. Atheism is not the default position in the absence of evidence for God’s existence.