Before Science there was religion but over time, as Darwin sailed around the Galapagos Islands, Copernicus gazed up at the sun and Galileo set up his telescope, religion fell over time and time again and science replaced it as the thing to turn to for the answers.
Philosophy is somewhere between the two, questioning matters concerning our lives but as science by its very nature is all about continuing to find the answers to questions, philosophy also has largely gone the same way as religion and become irrelevant.
While philosophical musings were common in more unenlightened times when mans knowledge was more restricted, it is hard to think of any philosophical question that Science today couldn't answer or wouldn't be able to answer in the near future.
The questions religion and philosophy attempt to answer all began with the word 'Why' but the questions science attempt to answer begin with 'How' and base their answers on proof and evidence as they currently understand them.
That is why philosophy has gone the same way as religion, replaced by Science answering the How questions which in turn makes the Why questions redundant and for a time when we were not advanced or knowledgeable enough to answer them based on the evidence.