The big question about guild altars was finally solved by yours truly. Anyways
here's how you get bonuses from altar.
Press c (character quick slot), ok do you see where it says- Contribution Points? yeah well that's what you offer into altar.
Go to The npc called [Altar]Priest in Sparta, talk to him and click on
Altar->Altar Building->(whatever god you want to offer to)->Worship God-> and then put in like 10k-20k points if you want to get any bonus, keep in mind your using contribution points not silver. The cool thing about it is that you only use a little bit of those points, like 120 points per hour, and you still get the bonus.. ^^