I find the conservative Christians argument that role-playing games are bad because they disagree with Christian worldview and can alter your morals to be so vague that they could apply to any fictional activity.
Fictional books, movies, television programs, and even children's play activities can be (and are) created which disagree with Christian worldview and teaching, contain fantasy pastimes, create memories and could (in theory) prompt the evaluation of ones values. Should all fictional activities be banned? I don't think so.
I have been unable to find any studies that investigated the claims that role-playing games enforce non-Christian worldviews upon the players. However I have found that the views of the conservative Christians described in the previous section do not seem to be representative of all conservative Christians. In fact it seems that most conservative Christians ministries ignore role-playing games altogether - it's simply not an issue.
Additionally, I have been unable to find any opposition to role-playing in other cultural or religious groups. I did find reports on how Saudi Arabia had banned the Pokemon role-playing card game, but this seems to be because they objected to what they felt was the Star of David printed on the cards, rather than it being a form of role-playing game.