On voting the official position of United is Christians should abstain from voting and running for political office but voting and participating in local issues isn't discouraged. As for myself I'm guilty of over involvement in politics BUT I'm making progress.
As far as proselytizing I'm sure it's discouraged. I'm not doing that. I know it's impossible for me to convert someone. But I am sharing the gospel of Jesus Christ and this is just a way of doing that.
So when Easter or Christmas or other holidays rolls around you post your articles to “share” the gospel with people here, knowing full well there are people who do believe in them. You would not want to pick a fight with those people and then go pat yourself on the back and gloat at church on how deceived the people on here are would you?