Is consciousness immaterial?

I've been doing a lot of scripture reading on consciousness (vijnana, mana, citta, etc) in the pali canon and Mahayana doctrines. Buddha never seemed to accept materialism, or that mind was material, in much of the scripture. But as someone who also observes the empirical sciences, I am a bit confused. If it is true we are all evolved beings from microscopic organisms over millions of years via cell growth and evolution, would this not verify, then, that consciousness is truly material in origin? That our thinking minds evolved and gradually arose, over the years, from some material and previously mindless thing like a single celled organism? Basically, my concern is this: if science is right that consciousness is just chemicals and nerves in the human brain, would a large part of Buddhism be disproved? If consciousness is really just a material reaction, would rebirth be impossible then since the mind would exist as brain functioning and cannot transmigrate? Basically, I seemed to have run into a block in my practice. I just have fundamental doubts about everything now. Is there a way we can prove the mind is immaterial or experiences the birth/death cycle...and is not just the evolved brain? Thank you to all.