There could never have been a time at which nothing existed. If there was never a time at which nothing existed, then it's not the case that "once there was nothing, and then there was something". Atheists are not forced to explain how something can come from nothing, because nothing never existed.
After browsing YouTube a bit, I found a video with an impressive 2 million views that claimed that dice show that God must exist. Naturally I was very sceptical of this claim, but I decided to give it a watch anyway. The video presented a version of the "fine-tuning" argument, but made a number of mistakes and logical fallacies along the way.