Susan Blackmore writes about the basic articles of faith in the Catholic Church:
Conceivably some of these things could be true (at least the ones that make enough sense to be testable) but the point of the "Catholic faith" is that you believe them, not because they are rational or reasonable, not because historical evidence supports them, not because modern scientific evidence supports them, but because they are "revealed truth". That is, you have to believe them because other people tell you that God told someone else they were true, and you must go on believing them even if they turn out not to be true by any normal standards of evidence.
The Catholic church doesn't allow its members to pick and choose which bits they believe; as a convert, you must sign up and believe it all, or not be admitted.
Source: Guardian [emphasis added]
Believing simply because other people require you to believe as a matter of moral obligation, and expecting that one believes a "whole package," without exception, is the wrong way to go about things. It may be an effective means for ensuring loyalty, obedience, and perpetual membership, but it's not a good way for ensuring that one's beliefs are reasonable, rational, and more likely true than not.
We can and should contrast this with science. Scientists and science students are taught what science has discovered, but everything they are taught can, in principle, be verified if one is able and willing to put in the effort to do so. In fact, a lot of practical science education entails students reproducing experiments to verify common assumptions and long-held results. Every successful test reinforces the accuracy of the original conclusion as well as the validity of the process itself.
Is it any wonder that science has consistently produced more improvements for human life in just the past couple of centuries that modern science has existed than any religion has over the course of millennia? It's not that no religion has ever produced any results of any practical good, but there is just no comparison with how much good has been produced by the scientific method and working scientists. If we are to judge a system by its fruits, religion loses.