I would like to correct what you state. Not just Xtians, but missionaries in general are not allowed to target people under the age of 18. Which, by the way, is reasonable. I believe that children should not be the target of missionaries, especially without the parent's knowledge. As for adults in Israel, missionary activity is frowned upon, but it is legal. This is, after all, the "Jewish State".
Islamist militants attack African Union base in southern Somalia (Reuters)
from the article: Palestinian Christian activist stabbed to death in Gaza