In Kornhorn he was confirmed by his mentor professor Jacob Jan van der Schuit.
He served as chairman at a number of important General Synods of the Christian Reformed Churches in 1941, 1947 and 1953.
He was also editor-in-chief of the official publication of the Christian Reformed Churches, called "De Wekker".
Kremer was the best person to attempt to keep together the Christian Reformed Churches, which in the period after the Second World War threatened to divide into two flanks.
He did this by making all kinds of things discussable and by weighing up the different visions in the brochure: "Tensions and dangers in the lives of our Christian Reformed Churches" (1953).
The congregation that meets in worship to hear the Word of God, among other things, is not a randomly composed group of people.
In 2019, a two-part collected work by Kremer was published by Brevier Uitgeverij in Kampen, Netherlands.