According to Osho, God-believers push conversion to muffle their own hidden doubt. By swelling the crowd, they borrow certainty from numbers - 'the whole world can't be wrong' - and thus repress, not resolve, inner uncertainty. Proselytizing becomes a psychological crutch of the sleepwalking masses. Authentic knowing stands alone; it neither seeks followers nor needs social proof.
People try to make others believe what they do because big crowds make their own shaky beliefs feel safe.