A Birmingham Crown Court handed down the sentence after he was found guilty of the offence.
Oluronbi, 60 was convicted of raping some children for a period of 20 years. He was said to have committed the act during religious bathing rituals he claimed would wash their sins away and cleanse them from evil spirits.
His wife Juliana Oluronbi, who arranged abortions after four girls became pregnant, was jailed for 11 years.
Both were found guilty by jurors at Birmingham Crown Court after a trial in January, BBC reports.
The trial heard Oluronbi had victims stand naked in a bowl of water to undergo what he called “spiritual bathing”.
He claimed it would cleanse their souls and protect them from the devil.
But Philip Bradley QC, prosecuting, told the trial Oluronbi’s true purpose “was to serve his sexual gratification”.
In some cases, he added, the offending “progressed to repeated rapes, on many occasions leading to unwanted pregnancies and terminations