I think unicorns may have been an adaptation of rhinos (it would make logical sense with the horn on their noses) so technically they do exist..
But seriously....there would be fossils or bones of some sort, as far as I am aware none of been found (I can't put this argument on God because he is spirit in nature)
Yet I hear as an argument for god, that we don't knwo what's out there, we don't have 100% knowledge.. so there's no reason NOT to assume there are unicorn bones, and we just haven't found them.. it's as rational for the argument that we just haven't found proof of god... "yet"
They logically make no sense....with a God if he does indeed exist, logically he is answering the why, science answers the what, how, where and when etc.
God has no explanatory power.. You're answering a question with a mystery that has no predictive ability at all, no insight, no answers in the least..
You're answering with "Mysterious ways" and "God did it.." and "Don't question god's plan" It is not an answer in the least. Answers explain. God just covers a lack on answers with a blanket of diversion.
There is no evidence for them, no sightings, no bones as above, no writings about them except from a fictional basis (of course I could be wrong here). While you can dispute the authenticity of them, God does have the Bible, people writings about Him, early church fathers etc, some of the history geographically can be proven etc. so it's the difference between having something (God) even if that something is debated and having nothing...
And how can you tell which of thr writings about them are fiction, and which aren't? How can you take an ancient book about unicorns, that doesn't state that it's fiction, or allegory, or literal, and tell which parts are real and which aren't?
And Homer's Ithaca has historically accurate places.. does that make it more probabe that it's non-fiction?
I've never felt a unicorn, never seen one, one has never helped me in any way shape or form (ie no personal experience)...I have personal experience with God.
And you are infallable, or can somehow verify that it's not false assertion, wishful thinking, or simply an error?
Can you use your personal experience in a way that would be predictive of future outcomes, or show that the ways he helped you were not the effects of your own actions and work, which you are attributing to him?
I can look at creation and see that there must be some sort of creator, the complexity of us as humans (I've mentioned the brain before), the beauty of nature, how things fit together (I'm a scientist, I love nature and how things work.) The wonders of how a child forms in the womb etc. apart from seeing a similarity to rhinos and where the idea may have come from, I can't do that with unicorns. I can't look at the beauty of something and say yep that is here because a unicorn exists.
So in short...evidence, logic, personal experience, nature/creation, archaeology, history etc
when you look at a tree, how can you tell YOUR god made it, and not Odin, or if it was made from the flesh of Ymir, or any other number of deities?
And nature IS beautiful, and fits together wonderfully.. by why not attribute that to science, physics, chemistry, gravity? Why do you need an omnipresent father figure above that?
And is there anything you have causing you to believe in a creator when you look at everything, other than your assertion, that that's the ONLY way you can possibly envision it??
I don't want you to think I'm in anyway looking down on you, or picking on your beliefs, but I simply don't see the world as you do... and I don't understand why just saying "I don't know" isn't good enough for some people. And I don't understand how people can take an objective look at their beliefs and not say "ok.. admittedly, I have nothing backing this, but it just makes me feel good."
Because I think if more people were able to do that with their beliefs, there wouldn't be AS much fighting against education, science, human rights... No forcing religions on others. It would just be a bit more "live and let live" from all..
Not that I'm saying you're not "live and let live" I'm merely speaking of religion in general.