The theory of evolution was/is not "a notion dreamed up by an atheists [sic]".
Firstly, the idea that organisms change over time is a very old idea, pre-Socratic philosophers such as Anaximander were among the first to propose that the diversity of life is the result of change over time.
St. Augustine of Hippo, rejecting a literal reading of Genesis 1, instead understood his Latin translation of the book of Sirach (which he, and most Christians historically, regarded as Scripture) that God created all things at once (Sirach 18:1"Qui vivit in aeternum creavit omnia simul" or "Who lives forever created all things at once", the Greek of the LXX from which the Latin derived uses koine where the Latin has simul, as such a better translation would be "created all things in common" however what Augustine had was a pre-Vulgate Latin translation). So in Augustine's understanding all things were created at the same time, however not in their present form, but everything was created in potential, in seminal forms which evolved, developed, and changed over time.
In the 18th century there was already two important ideas forming within the scientific world.
1) That the earth was very old, at least millions of years old if not older.
2) Life evolved and had been evolving, and living things were related to one another.
These were not ideas produced by "atheists", but ideas that arose within the scientific community, many of these scientists were not only devoutly religious, but were members of the clergy.
What Darwin observed in his visit to the Galapagos Islands and which he proposed in Origin of the Species wasn't evolution--that was something western scientists had already been accepting for decades--it was the mechanism that drove evolution, namely, natural selection. Natural selection is what Darwin proposed, not evolution. Further, Darwin was not an atheist. Darwin had been a religious man early in his life until he lost his child, and like many parents who lose their children experienced a crisis of faith. Darwin's own views, for much of his life, float around somewhere between a sort of "soft theism" and agnosticism.
The idea that atheists came up with the theory of evolution in order to remove the place of God in the appreciation of the natural world is demonstrable fiction and propaganda. Further, even if the chief brains from which evolutionary theory had developed were those of atheists it would be irrelevant, since science, if it is science, remains science. It doesn't matter who proposes a theory, if the theory is true then it is true. That the earth is round doesn't become false simply because a non-Christian says it. That is among the worst kind of tribalistic thinking.
I'm sorry, but the Creationist propagandists you have been learning from have been selling you snake oil.
-CryptoLutheran