He had been taught the assembly's catechism, but he says he never gave credence to the trinitarian doctrine, and his studies confirmed him in Arian views.
The then Lutheran Ferenc Dávid was appointed rector but shortly afterwards he converted to Calvinism (1564–1567) and then Anti–trinitarianism, and from 1568 Unitarianism.
Theophilus, the first known bishop of the Goths, defended the Trinitarian and Orthodox Christological position against the Arians at the First Ecumenical Council in Nicea 325, and signed the Nicean Confession of Faith.
Muslims, Jews, Unitarians and other nontrinitarians claim that the orthodox trinitarian Christian doctrine of the Holy Trinity of Father, Son and Holy Spirit constitutes Tritheism, since these distinct "persons" are unified only by an impersonal substance ousia which does not transcend, or exist apart from, the persons.