There are many arguments that I have used that no atheists have been able to refute yet.
Let me say once and once only, that this is only for the argument of their being a God and not a certain God.
The Domino Example:
Think of our existence like a line of dominoes. Each domino before is affecting the next representing the flow of time as well as space, where the dominos are, and matter, the dominoes themselves. The dominoes falling represents time/space/matter working.
Now Atheists usually can't explain how the universe came to be, so they usually revert to the argument that the universe has just been infinite and gone on forever.
So, let's use the dominos in this example.
If the line of dominoes was infinitely long, then the dominoes wouldn't ever fall, because there would never be a beginning to start the chain reaction from.
So, in order for our universe to make sense there had to have been a beginning. But whatever started that beginning had to have been more powerful than the dominoes (time/space/matter) and exist outside that reality.
Take that in.
Atheism is too simple:
Atheism turns out to be too simple.
If the whole universe has no meaning, we should never have found out that it has no meaning.
Just as if there were no light in the universe, then therefore no creatures with eyes, we should never know it was dark.
Dark would be without meaning.