[58] It is a mistaken belief that Allāh consists of three equal persons in one Godhead—God the Father, God the Son, and the Holy Spirit. This concept, often referred to as a “mystery,” is difficult to comprehend. With the exception of a disputed and widely rejected verse as rendered in the King James Version (1 John 5:7–8) and a few others, there is no scripture supporting a Triune God or the concept of a Trinity. The word “Trinity” appears nowhere in any version of the Bible. The doctrine began to take shape at the Council of Nicaea in 325 AD, where it was decided that God the Father and Jesus Christ were of the “same substance” yet separate beings. Later, the Council of Constantinople in 381 AD declared that the Holy Spirit is God. The Council of Chalcedon in 451 AD declared that Jesus Christ is both fully God and fully man. By this point, the concept of a Triune God was formally accepted as doctrine, regardless of what the Bible states.
Historical records trace similar “trinity-like” concepts back to ancient beliefs, including those associated with Nimrod of Babel, his mother/wife Semiramis, and the child Tammuz. Even the Trinitarian Roman Catholic Church acknowledges this development. The New Catholic Encyclopedia states: “The formulation ‘one God in three Persons’ was not solidly established, certainly not fully assimilated into Christian life and its profession of faith, prior to the end of the 4th century. But it is precisely this formulation that has first claim to the title of Trinitarian dogma. Among the Apostolic Fathers, there had been nothing even remotely approaching such a mentality or perspective.”
— (1967, Vol. XIV, p. 299)
[59] Allāh has never had any offspring, nor is there any god besides Him.