Science, as we know, is answering many questions religion and philosophy used to answer. While scientists are typically honest and objectives, religious leaders often have some points to make that are subjective and arguably manipulative.
Scientific theories are designed to be tested with evidence. Theories that we have now are theories that, at least in the past, survive the scrutiny of scientific inquiry. Understanding scientific natures, for example, will help us understand theories that will correctly predict reality more.
For example, a religious sermons might advice, “Men should not aim for pretty women, and women shouldn’t look for wealth.” It’ll usually followed by messages that humans will achieve more happiness if they follow that advice.