I would say "The bible tells us not to worship false idols, therefore we are no longer accepting the Easter Bunny or Santa Clause as important figures in these holidays." But, I don't even believe in god and religion is a joke so I might be the wrong person to answer this question.
You would complete objectives to complete a mission. Objective is to mission as battle is to war.
You should watch where you walk because you might be stepping on Smurfs. ; )