The invitation system harmonizes with certain features in our psychological make-up leaves it open to serious objections. These critics argue that the way conversions are produced under this system by a pressure on the will is little different from the way in which “conversions” which make no claim to be Christian at all often take place. The “conditioning” of a large crowd of people in a controlled environment, with methods of persuasive suggestion leading to a demand for a public response – an emotional release – is psychologically certain, they say, to provide results regardless of whether the crowd meets in the name of religion, entertainment or politics.