If Sir Issac Newton were alive today I doubt he would be making that statement, we have learned a thing or two in the last three hundred years . You argument is known as an "appeal to authority", but it is weak because, while Isaac Newton was a really smart guy, he knew nothing about DNA, the fossil record and evolution, and a few thousand other things that have been discovered since his time.
And scientists are actually quite close to creating a functioning artificial hand. While evolution got a head start of millions of years, recent advances in all fields of science make it a certainty that fully functioning artificial limbs will be a available in the near future.
Way back in the early eighties I worked for a company that had a computer to automate tracking their manufacturing process. The computer took up an entire large room, and it held less data that my current smart phone. In fact, knowledge in all science fields has increased dramatically in those 35 years. At that time I was still a JW and believed evolution was a hoax perpetrated by scientists, but to believe that today you have to stick your head in the sand. Why would you do that?
If God exists, he certainly doesn't want you to live in ignorance. At one time people were persecuted for believing the earth revolved the sun, as if that somehow disproved God's existence. But knowledge won out and people kept believing in God. Not believing in evolution today is equivalent to believing the sun revolves around the earth. So why are you so afraid to look at the evidence objectively? Is your faith so weak that it will wither if you do?