In 1925, Kim became a member of a Protestant church and began studies at Tohoku University in Japan from which he graduated in 1930.

All three were Taiwan-born members of a Protestant church in California that sends members on brief missions into China to lend moral and financial support to the so-called house churches.

During his youth, he became an active member of a Protestant church, Iglesia Evangélica Restauración en Cristo in Bayamón where he occasionally offered sermons.

One of the qualifications of being a member of the Board of Trustees is that he/she must be preferably a Baptist or any member of a Protestant Churches.