Edison also 'wasted' lots of time on inventions that didn't work.
Second,I do not know if anyone has ever been able to prove that Darwinian evolution is "true." If you can point me to such proof, please do so.
Even if Darwinian evolution is considered "true" today, it could certainly be proven "untrue" tomorrow. If that is the case, then your second point means nothing.
The central point in this whole debate is whether the Bible is true or not. Evolution raises some serious theological questions. First, the Bible says the wages of sin is death. If there were billions of years preceding the rise of humans and the introduction of sin into the world, what accounted for all of that death?
Second, other places in the Bible refer to the creation of the world. Exodus 20 for example says that God made the world in six days and rested on the seventh. If that statement is not true, then how can you establish the truth of any biblical statement. For example, how can one establish the validity of the virgin birth of Christ, His resurrection, His divinity, His promised return, or the promise of eternity?
If texts referring to origins are debatable because of relatively modern theories that seem cogent and are accepted by "scientists," why should any of these biblical ideas be accepted? They certainly seem to be contrary to "scientific" principles. Should they be discarded as well? If so, you would be left with a Bible that is eviscerated.
The only relevant inquiry in the end is what is the source of "truth?" Is it something determined by the finite minds of feeble men, or does it reside in the Almighty? In order for us to know truth, we must possess omniscience and omnipresence. You must be able to be everywhere to find truth and have the ability to truly know everything.
I do not think that any mere man could make such a claim. Therefore, it would be simply impossible for mortal finite men to establish truth.