Have you come up with any evidence for what you believe, yet?
There is no requirement for me to provide evidence to justify things I don't believe - the onus is on those who do believe to provide the evidence.
So if, as you are suggesting, atheists are required to provide evidence for things they don't believe in then you will also have an extremely long list of things you don't believe in that you equally will be required to provide evidence in justification. Let's start the list (and please do correct me if there are any here that I have erroneously suggested you don't believe when in fact you do):
That Thor is real and the god of thunder
That JFK didn't die but was abducted by aliens
That Paul McCartney died in 1966 and was replaced by a body double
That there is an invisible teapot in orbit around Saturn
That there is a pot of gold at the end of the rainbow
etc etc
I suspect you don't believe in any of those things (nor do I) and neither you nor I are required to justify our lack of belief - the onus lies entirely on the believers in those things to justify the veracity of their belief.
And in exactly the same manner I don't believe in your god, just as you don't believe in Thor and therefore I am mo more required to justify my lack of belief in your god than both your or I are to justify our lack of belief in Thor. You, on the other hand do believe in your god and therefore the onus is on your to justify that belief.