The act of seeking converts to a faith. However, many Christian groups – particularly the Roman Catholic Church – draw a strong distinction between proselytizing and evangelizing. Proselytizing is viewed as the use of unethical methods – such as coercion, bribery or threats – to bring conversions. Evangelizing is considered a pressure-free effort to present the faith and invite others to freely accept it. This distinction explains why Pope John Paul II frequently condemned proselytizing while encouraging – and engaging in – evangelization. Do not use the word proselytize unless you know it is being used in a negative context. Evangelism (Protestant) or evangelization (Catholic or Orthodox) are the preferred terms.
REFERENCE: Religion Stylebook