And we know that for those who love God all things work together for good, for those who are called according to his purpose. For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the firstborn among many brothers. And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified. Romans 8:28–30, ESV
The unregenerate cannot conceive of a religion unless it is fully entwined with the exercise of free will as an expression of devotion or belief. Genuine Christianity is not a religion if that is how religion is defined. Authentic Christianity consists of God’s work in the hearts of those whom He gave and drew to Christ.
The Holy Spirit regenerated them at the will of the Father as they heard the gospel thereby enabling them to believe and repent. From that time forward they serve their Saviour and God as His disciples. Their divine faith, a gift from God, overcomes the world as they obey Him, love Him, and love their brethren. They share their faith with others thereby being obedient disciples whom God uses to bring others into the Kingdom.