"Circumstantial Evidence"

Upon rising one morning a camper said to his friend, "There was a bear outside our tent last night."
The friend inquired, "What did it look like?"
"I didn't see it" came the reply.
"Oh, you heard it, right?"
"No" came the answer."
"Well, then, did you smell it?"
Once again the answer was "No."
"How can you say there was a bear in our camp last night?" asked the puzzled camper.
"Because of the fresh bear tracks on the ground!" was the reply.
The heavens are telling of the glory of God;
And their expanse is declaring the work of His hands.
Psalms 19:1

For since the creation of the world His invisible attributes,
His eternal power and divine nature, have been clearly seen,
being understood through what has been made...
Romans 1:20

No one witnessed the creation of the world. How do we know God did it? The evidence contained in the universe: from the smallest particle of matter to the expanse of space; from the tiniest living things to man himself; from the precision of planet movement to the vibrations of atoms.
These are things too great to grasp; too wonderful to comprehend;
too complex to be accidentally or incidentally caused. We didn't see Him do it, nor can we see Him working now.
His handiwork is powerful circumstantial evidence! John said God's workings is like the wind. You can't see it (Him), but you can see the evidence of its (His) existence.