Nice poem.
Moments of silence are very important for me. They are moments of contemplation. I appreciate that form of prayer. It must have been hard for children.
We have too many distractions in our daily life. In public transportation I see so many people's attention being sucked in by their cell phones, that is kind of scary. They seem afraid of being bored, of being alone with themselves, with their thoughts, with their feelings. I imagine that breeds some insecurity that we try to fill in by consuming stuff we don't need. We focus on "having" rather than on "being".
Silence in a group can also be a powerful thing, you have that right. Instead of just "being", we are all "being together". It says "I'm glad of just being here with you". However, the problem is that silence can, some times, be misinterpreted.
Personally, I really need my time of silence, reflection and contemplation. My moment alone, with my thoughts and my feelings. Going to the mass was never a pleasant experience, since it was always the same thing, over and over. It looked scripted and phony. I think I like what you describe better. Quaker's take on religion seems quite interesting. At least from a first superficial look.
Regarding the giveaway, I'm in if I may. What? The game Slicence does not come with the soundtrack included? :-P I wonder if the music was composed by,John Cage... :-D