After reading these books,he was converted to the Darwinian

关键是搞清楚这里的convert的意思是“使皈依;使改变信仰”
给个例句：使皈依;使改变信仰[(+from/to)]
The priest converted many natives into Christianity.
这个牧师使许多土著居民改信基督教
楼主给的本句的意思：
看完达尔文的《进化论》,我成了进化论的信仰者了.