It's current popularity probably stems from the urgent need to vent the stresses of modern day living and by the desire to expand one's own potential. There is a movement of sorts among many enlightened people of our generation to broaden their mental and spiritual evolution, and meditation provides an avenue to accomplish this.
Meditation has no conflicts with any religion.
In fact, it embodies the best principles of most religions by enhancing your own self worth and relationships with your fellow man. It puts you in a more relaxed state of mind, more receptive to your own religious values and perhaps to even communicate more effectively with your God. When you are at peace with yourself and those around you, the world is a much happier place for everyone, and goodwill towards your fellow men and women is a logical end result. From the moment you are born, your mind functions every second, minute, hour, and day of your life. It's active day and night, extensively while awake, less so while you sleep, but continually working.