Our teacher actually went through this today if what you are referring to is religion as a living religious tradition.
Put simply this means that religions can only survive or 'live' if they make themselves relevant to today's society. This means that they have to adapt in order to suit our spiritual needs today. For example, rock music or something like that makes religion dynamic as it still celebrates the core beliefs through song but in a way which appeals to people today. The main takeaway is that in order to be a dynamic living reality, religions must be relevant to their adherents and give them a sense of meaning which is fulfilling in today's changing world.
Hope that helps!