Christian Science enjoys associating itself with famous people, great thinkers, and Albert Einstein. Einstein fits both aforementioned categories nicely, and what better way to give some merit to Ms. Eddy’s claims than to say one of the greatest minds of the twentieth century was somehow involved, intrigued, or interested in it.
The Researchers at the Mary Baker Eddy Library very diplomatically state that:
Much of the evidence of Einstein’s interest in Christian Science has proven unreliable or based on sources that can’t be verified. However, there is certainly evidence to suggest that Einstein had some interest in Christian Science. (1)
So yes, much of the evidence is unreliable, but of course Einstein was interested in Christian Science. The Library is careful to reason through anecdotal evidence and provide proper footnotes, including the oft-cited paper by William S. Cooper, Professor Emeritus University of California, Berkeley, On Albert Einstein’s Interest In The Metaphysics Of Mary Baker Eddy, (2)
Cooper’s paper is worth reading, in addition to citing anecdotal evidence — apparently Einstein attended a Christian Science lecture, he states
So far as I have been able to discover, Einstein never commented in writing on Eddy’s metaphysics, and in conversation spoke about it only in generalities.
As far as Cooper can tell, Einstein never addressed Christian Science directly. A bit further down, Cooper concludes
… Eddy’s metaphysical system stands in general sympathy with his stated reservations about popular religious thought, concerns itself with the derivative character of matter, and shares some ground with some of his favorite philosophers. (emphasis mine)
Christian Science shares some parallel ideas with some of Einstein’s favorite philosophers. Given Ms. Eddy’s propensity to liberally borrow from various philosophical and religious dogmas I can hardly claim to be surprised.