I have personally known converted communists. I myself was a militant atheist in my youth. Converted atheists and communists love Christ much, because they have sinned very much.
Strategic thought is needed in missionary work.
It is more important to win a man of great influence, who can afterward win thousands, than to speak to a savage in the jungle assuring salvation only for him. Therefore Jesus chose to end His ministry not in some small village, but in Jerusalem, the spiritual headquarters of the world. For this same reason Paul strove so much to arrive in Rome. We tickle the serpent on the belly, making him laugh. The head of the serpent is somewhere between Moscow and Peking, not in Tunis or Madagascar.