Does it really go KABOOM?
Perhaps the better question to explore is why skepticism has the potential to lead someone to an atheistic posture.
Skepticism is simply shunning belief that is not accompanied by strong, supporting, verifiable evidence. You recognize that you simply cannot afford to take everyone at their word all the time. This realization even encompasses the grand authorities in one's life.
You should endeavor to think for yourself.
Nothing is wrong with consulting people smarter than you. I like to call such people "experts".
But I do not like to label anyone an "authority". The title "authority" implies that such a person not only knows the truth of reality, but dictates truth in an infallible manner.
Experts, in my view, are well skilled in their craft and their knowledge is extensive. They have honed their abilities to a level of professionalism. But they can make mistakes. You should speak up when they do or when you don't agree with their actions. Or when you want evidence to back up what they are saying.
Authorities, in my mind, dictate truth whether right or wrong. They demand you always accept what they say as truth without any proof beyond the simple fact that they said so.
So when someone says that all the nations of the world must believe in God their way and that there is no other way to know God-- a skeptical person defers to doubt towards that specific believer. And that doubt will most likely generalize to that believer's God as well.
When all major religions push to make the world believe just as they do, God's followers start sounding very suspicious. They all cannot be exclusively right. And unless only one religion is right, all religions must yield a little to the others. So then, who has a right to warn others of the coming wrath of their god?
I say that mixing skepticism and atheism is at least a reasonable practice even if skepticism doesn't necessitate a turn towards atheism.
However, I think the real danger is when someone mixes radical Fundamentalism with technology. That seems to be the true formula that goes KABOOM!