The Google Ngram Viewer is an online phrase-usage graphing tool. It charts the annual count of selected words and phrases, as found in more than 5.2 million books digitized by Google up to 2012. This is how the frequency of the words "Jesus", "Marx" and "Lenin" has changed over time.
This is a chart based upon the database of books in British English:
In British books, Marx peaked in 1978. That was the year of the Winter of Discontent! Lenin peaked in 1942 when the Soviet model was widely considered as a valid alternative to the chaos called democracy. The winner is, however, Jesus, who holds his popularity over time despite temporary fads concerning the above mentioned false prophets.
The following chart shows the same for books written in American English. Jesus not only clearly wins in America, but he has been even widening his edge since the 1960's!