There is no prohibition in Israel on practicing a religious faith, speaking about a faith, proselytizing a faith (with exceptions, noted below), or singing songs of faith. Israel has freedom of religion for all faiths.
That said, from my understanding, most Israelis have very strong feelings against attempting to convert people.
Exceptions for proselytizing in Israel's Penal Code:
Giving benefits to induce change of religion
174A.If a person gives or promises another person money, valuable consideration or another material benefit in order to entice him to change his religion or to cause him to entice another to change his religion, then he is liable to five years imprisonment or a fine of NS150,000.
Change of a minor's religion
368. (a) (b) If a person performs a religious conversion ceremony of a minor or performs some other act that leads to the change of a minor's religion, in violation of the provisions of section 13A of the Capacity and Guardianship Law 5722-1962, then he is liable to six months imprisonment. If a person induces a minor, by addressing him directly, to change his religion, then he is liable to six months imprisonment.