I think one of the things that really appealed to me about SoE was that it was a "safe harbor" of good Christian players within the masses of Guild Wars; at least one other member expressed the same sentiments after being rudely spammed by some guy. Pulling in non-Christians, while very well-intentioned (seeing others come to Christ is always a good thing), might not be best for the guild, especially given that we have other ways (i.e. the friends list) to connect with other players.
And as Slice noted, evangelism over an online RPG is always a dicey affair, because ultimately people are probably more like to take it like e-mail spam than interpersonal conversation. I wish it were not so, but I would probably feel uncomfortable about being evangelized in a "fantasy" world.
That being said, I have thought of a few ways the guild could "be a light" in... small things to let others know that there are selfless players in the world:
1) Offering up our characters for "assistance" to others free of charge at major towns; maybe helping them complete a hard quest (i.e. Althea's Ashes, Villany of Galrath) or even a simple one (i.e. Across the Wall in the pre-searing era). In fact, I bet a lot of newbies would benefit from a partner in the pre-searing era.
One great example of this were two guys I met last night who were running to Draknor's Forge. They advertised a free run and refused to even consider donations until they had arrived at the forge. They had been 5 for 5 that night but got bogged down about a third of the way there. Instead of quitting, they invited us all back to Beacon's Perch to try again. On the way they were both more than open in explaining to me how they did the run, and what kinds of skills were effective at it. They said they did it because they did not like the scamming that went on, and I am certain that everyone in the group felt a little better about the world for having hung with these two guys.
Although I doubt we have too many pro forge runners in our guild, helping people through hard segments and asking nothing in return would be a nice thing to do.
2) Offering up rare/unique/powerful weapons we find in the field - especially ones our character doesn't use - to our allies.
3) Warriors can really make the day of healers and casters by coming to their aid when they are under attack. A lot of warriors (myself included, sometimes) charge into battle just as opponents are charging past them and into the backline. Calling a target that is harassing a monk or caster will earn a lot of appreciation. Warriors who ask for energy counts on healers can also make their day.
Just a few thoughts.
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Nestor Elias (Mo/W 20)
Panos Adrastos (W/E 18)
Theron Faustus (Me/R 13)