 Some 16th-century anti-Trinitarian divines sought to reconcile Christianity, Islam and Judaism; on the basis of very similar arguments to those presented in the Gospel of Barnabas, arguing that if salvation remains unresolved until the end times, then any one of the three religions could be a valid path to heaven for their own believers.The Spaniard, Michael Servetus denounced the orthodox Christian formulation of the Trinity (alleging the only explicit reference to the Trinity in the New Testament to be a later interpolation); and hoped thereby to bridge the doctrinal divide between Christianity and Islam.In 1553 he was executed in Geneva under the authority of John Calvin, but his teachings remained very influential amongst Italian Protestant exiles.