In the mind of muslims, the same could be said. Christianity is all gobbledy gook, the Quran is actually the truth. Same could be said for any other religion.
Before this conversation gets derailed I should say that this is not about which religion is correct or incorrect but about the existence of Psychology, which unfortunately has been tainted by the idea that religious beliefs hold more value than science. To me this causes a fair bit of conflict because it just devolves into a religion vs science argument, many scientists and psychologists are and have been religious however, but the main source of conflict arises from faith and belief.
Science is rigorously tested, experiments can be performed and psychology is real, that is unless you are religious, in which good things happen to you because you're a good person and god likes you and everyone you dislike is the work of satan, whereas in psychology, benefactors like a person's upbringing or relationship with others are the cause for their poor behaviour, not satan, the universal boogeyman.
When it gets like this and people start bringing up Christianity and then claiming it to be the truth, theres a lot of errors in what people say, because their only proof is "Everyone else says this, god says this and my bible says this, so it's true." but to those people, suddenly science is false, even though a large number of people also agree that science is correct? So what makes religion more right than science? In my opinion, Science is more correct because of the everyday studies and analysis' you can perform, the laws of physics come to mind.