But, when you are guided by blind faith, you do not need brain anyway. Similarly, people who carry a cross around their neck and kill draculas using the cross, have intellectual nerve to try to criticize one of the most scientifically developed technique in the world. All because, we started having doubts. They need techniques to get there. Meditation, Tantra, Mantra are techniques that can be used by different strata of people.
Different people have different personali- ties and different aptitude.
One method is not suitable for all.