@Sheril
The quote is completely wrong though. Because his focus was science, he saw people change their minds more often in science.
However, if you look, you will find stories of people who used to be Muslim but converted to Christianity, you will also find stories of people who used to be Christians but converted to Muslim or many other religions.
Also, in politics, people change parties all the time.
In both cases, it may not happen as often as it should, but they are human too.