In 1957 Elder S. A. Adewunmi who was then the Baba Aladura died, the mantle of office of Baba Aladura fell on Elder Josiah Soyemi Olugbusi, but a visioner delivered a message that “no Baba Aladura should be ordained until 3 years, 3 months, 3 weeks, and 3 days after the death of Baba Aladura S. A. Adewunmi”.
He accepted the challenge and was acting as Baba Aladura for 3 years, 3 months, 3 weeks and 3 days until he was subsequently ordained Baba Aladura in December, 1960 by the Mount Zion Section of the Eternal Sacred Order of the Cherubim and Seraphim. He held the post until the Board was re-constituted in 1961, and he became the First Baba Aladura of the re-constituted Eternal Sacred Order of the Cherubim and Seraphim in 1962.
Elder Josiah Soyemi Olugbusi-Ajagungbade came into contact with Moses Orimolade Tunolase, the founder of this Holy Order who was then living at Agoshofin Street in Lagos, before the Order was named Seraphim in September, 1925. As he was not resident in Lagos, his membership was not well known to several people. In 1927 he relocated to Lagos and became a regular member at a Bible Class under H. A. Phillips, then a Leader. He was in fact the secretary of the Bible Class. He held this post until 1929 when there was trouble in the Order and H. A. Philips and others left the fold to form their own sect.
The spiritual father refused to follow H. A. Philips out of the fold. Out of about 1,500 members of that Bible Class only himself and his family opted to follow the founder Moses Orimolade Tunolase when the group seceded in May 1929. Baba Aladura Dr. G. I. M. Otubu who was the author of his biography was one of those who saw the letter addressed by him to the Permanent Secretary of the former Ministry of Lagos Affairs as Secretary of the Organisation reporting the death of the founder, Saint Moses Orimolade Tunolase, and the subsequent appointment of Elder A. W. Onanuga, as his successor.
During his tenure of office, the following Bands and Posts were created the Army of Christ, the Supervising Apostle and Mary as anointed cadres and the post of the Chancellor.
He died on Holy Trinity day, Sunday 17th June, 1973 and was buried at Oko-Oba Agege.