During COVID-19, many people in the world experienced tremendous suffering. Because of its strong infection rate, people avoided gathering. In these circumstances, public worship, which is the heartbeat of the church, has declined. The decline in participation is especially true among one group of marginalized people: the people who are cognitively challenged. Traditionally, the Korean Church has not had much concern about the matter of public worship and the sacraments for those who are cognitively challenged, except for a few churches which have special departments for ministries to special populations. During the COVID-19 situation, these ministries have slowed, which means that those who benefited have had few opportunities to join worship services or participate in religious education. Going forward, there is a high possibility of another pandemic. Therefore, it is time to prepare for the future. Some churches have utilized online worship and Zoom meetings, showing that the cognitively challenged can effectively participate in online worship and religious education if family members can help them. Churches should invest in new platforms which harmonize onsite worship and online worship and expand resources to create new software for Christian education.