I have seen probably 10 of these sessions where Ray Comfort is witnessing to people on the street. In this episode, the man actually prays to receive Christ. In Matthew 13, Jesus says:
"Behold, the sower went out to sow; 4 and as he sowed, some seeds fell beside the road, and the birds came and ate them up. 5 "And others fell upon the rocky places, where they did not have much soil; and immediately they sprang up, because they had no depth of soil. 6 "But when the sun had risen, they were scorched; and because they had no root, they withered away. 7 "And others fell among the thorns, and the thorns came up and choked them out. 8 "And others fell on the good soil, and * yielded a crop, some a hundredfold, some sixty, and some thirty. 9 "He who has ears, let him hear."
Matt 13:3-9 (NASB77)
Fruit is the only proof of genuine conversion. Out of all the soils that made a profession, only 1 of these actually produced fruit. Just think about how many people he had to go through to get one person who was willing to actually pray. Think about how many religious people are sitting in church that may not be genuinely saved.