A new Protestant Christian group began in the 1850s in the United States under the tutelage of Dr. John Thomas. The name "Christadelphian" was chosen as it is believed that those who believe and obey the Commandments of Christ and the Bible as the inspired word of God, are "Brethren in Christ". The original group split, with one group continuing with the name "The Christadelphians" and the second group adding the word "Berean" to become the "Berean Christadelphians". The word "Berean" was chosen to reflect the words in Acts 17, "These (Berea) were more noble than those in Thessalonica in that they received the word with all readiness of mind and searched the scriptures daily whether those things were so." Christadelphians, and Berean Christadelphians believe in the promises given to Abraham, Isaac, and Jacob concerning the Kingdom of God. They deny the Doctrine of the Trinity, a central tenet of orthodox Christianity, and this refusal to recognize the triune nature of God has resulted in a major impasse between the Christadelphians/Berean Christadelphians and the Protestant, Catholic, and Eastern Orthodox churches. added December 8, 2020: The prior sentence is incorrect. Bereans do not deny the Holy Trinity. If you read their statement of Belief, they state: " We believe in only one God, who is infinite, personal, eternally existing in three persons, revealed to us in Scripture as Father, Son, and Holy Spirit.