For 2,000 years, the theological theory of the Trinity has been seen as a basic tenet of the Christian faith. But, is God truly a Trinity? What, exactly, is the relationship between the Father, the Son, and the Holy Spirit? One day, Brother Zhang posts a question in his church's online discussion group: Does the Trinity really exist? This question begins an intense debate among the believers, after which Zheng Xun and Li Rui discuss and fellowship on this question. What is their conclusion? Please enjoy the crosstalk There Is Only One God.