Zeal of the convert

The zeal of the convert is a term describing the very fervent devotion to new beliefs, which are completely different from one's old beliefs.

Usage
The term "zeal of the convert" is commonly used in popular culture as it is believed that converts to new beliefs are likely to show more devotions than those born in the beliefs.

Examples

 * Richard John Neuhaus, a new convert to Catholicism in 1990, held a stronger belief in Catholic doctrine than those who had only ever been Catholic.
 * Paul the Apostle, formally known as Saul of Tarsus was a Jewish Pharisees who persecuted Christians until he had a life changing vision on the road to Damascus and became a Christian missionary who spent his life spreading Christianity throughout the Roman empire and was later executed in Rome for his devout Christian beliefs.

Statistics
In the United Kingdom, less than 4% of Muslims are converts, but 12% of domestic jihadists are converts. 69% of converts claim that religion is vital to them, compared to 62% of non-converts. 51% of converts worship at least once a week, compared to 44% of non-converts. 82% of converts claim an absolute belief in God, compared to 77% non-converts.