Evolutionists cannot prove their case against creationists,
Only partially correct. It can be shown that the earth and all life on it was not created in a 6 day period 6000 years ago. It can be shown that there was no world wide flood 4500 years ago.
If you were to say that God started the universe 15,000,000,000 years ago, created the earth 4,000,000,000 years ago, and created the first 1 cell creatures 3,500,000,000 years ago then I would agree that science could not refute you.