Do you agree with the children’s decision to try to rescue Mr. Tumnus? Why or why not?

This is asking for your opinion rather than mine. I think it was a good idea to rescue Mr. Tumnus. It shows the children, most of them, have empathy and are willing to risk their own lives for a friend in need. Saving Mr. Tumnus echo's many of the major Christian themes in the novel.

yh what i think about this they made the right thing they are really good kids eccept ebmund

I agree as Mr. Tumnus had saved Lucy from becoming the white whitch's slave and had risked his own life on her behalf. The children were brave and nicely raised [well all of them except Edmund] so I do agree.