Pastor Gregory Toussaint was born in Haiti, in the commune of Carrefour, a southern suburb of Port-au-Prince, the capital. Until the age of 7, he attended the Evangelical Indigenous Church of Haiti and was enrolled in the Notre-Dame de L'Assomption school in Carrefour. Having moved to Lalue, an upper district of Port-au-Prince, he continued his secondary studies at Collège le Normalien and attended the Apostolic Church of the Faith.