The whole purpose of religion is to answer questions about life. In an era when science offers such soundly supported explanations on life many people are willing to give up traditional religion. In this day and age people are encouraged to use logic. In fact, people are made to use scientific thought if they want to succeed. The problem with traditional religion is that blind faith in stories, which are often very hard to believe, is required from followers.
Science is, many times, more appealing because supported theory is what people are asked to believe.
It's much easier for a learned man to believe he has evolved over millions of years than to believe that Adam and Eve were just plopped down on Earth by God. Science has proven that this is impossible. With so many biblical explanations about life being replaced by sound scientific theory, people are bound to start putting their faith in science. If a person says that he no longer puts faith in traditional religion but instead science, then he is making science his new religion. Science has been able to convert people into followers of logical thinking without religious wars or crusades.