Conversation so far:
What religion was Sun Yat-sen born with?
His parents believed in traditional Chinese religion.
Did the article say why Sun Yat-sen was interested in Christianity?
In the early 1880s, Sun Mei sent his brother to ʻIolani School, which was under the supervision of British Anglicans and directed by an Anglican prelate named Alfred Willis.
Is there any other data on Sun Yat-sen's religious views?
Although Bishop Willis emphasized that no one was forced to accept Christianity, the students were required to attend chapel on Sunday
how did Sun Yat-sen's views on christianity affect his politics?
In his work, Schriffin speculated that Christianity was to have a great influence on Sun's whole future political life
Was Sun Yat-sen ever baptized?
Sun was later baptized in Hong Kong (on 4 May 1884) to his brother's disdain.

Question: Who baptized him?
Self-contained rewrite: Who baptized Sun Yat-sen?