The creation itself preaches so eloquently Who He is, and how He is.
For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. Romans 1.20a
The remainder of that same verse pulls the rug out from under us...
So they are without excuse.
This is quite unfortunate for us, because we do love our excuses.
And we think each and every one of them is pretty good!