The implication of this question is that Newton and Einstein concluded that the universe must have had a designer and have made statements to that effect. I will submit to you that Newton probably did; I requested information from you in support of your statement in regards to Einstein. My point is you haven't, nor can you.
Looking for links to answer that question have provided some interesting articles.
This physicist tries to postulate a designer very intelligent, but of course, not God.
http://www.physlink.com/Education/essay_weinberg.cfm
There’s this....
http://www.mtoomey.com/EinsteinViewOfGod.html
But this is what you’re looking for...
http://www.veritas-ucsb.org/library/origins/quotes/universe.html
“The scientist is possessed by the sense of universal causation ... His religious feeling takes the form of a rapturous amazement at the harmony of natural law, which reveals an intelligence of such superiority that, compared with it, all the systematic thinking and acting of human beings is an utterly insignificant reflection.”
Albert Einstein