In a statement, Christian leaders from across all denominations said to deny basic necessities to children and civilian would not enhance security but instead it would kill innocent people.
"To deny children and civilians their necessary basic commodities are not the ways to security," the heads of churches in Jerusalem and the Holy Land said.
"This siege will not guarantee the end to rocket firing, but will only increase the bitterness and suffering and invite more revenge, while the innocents keep dying."
Going further, they admonished Israel for 'collectively' punishing everyone in the Gaza Strip, saying it had no legal justification and it breached the basic human and natural law.
"One and a half million people imprisoned and without proper food or medicine. 800,000 without electricity supply; this is illegal collective punishment, an immoral act in violation of the basic human and natural laws as well as International Law," they said.
The church leaders also urged the two Palestinian factions, secular-based Fatah and Islamic-based Hamas, to set aside their differences for the greater good of people living in Gaza. The two warring parties clashed last year, where the Islamic group seize control of the Gaza Strip after a short but bloody conflict.
"Put the differences aside and deal with this crisis for the good of all human beings demonstrating that you care for your brothers and sisters who have suffered enough already," the Christian leaders stated. "We would say to all concerned parties; while ever you persist in firing rockets into Israel you encourage public opinion outside this land to feel there is a justification for this siege."
They added, "We pray for the Israelis and Palestinians to respect human life and God's love for every human life, and to take all possible measures to end this suffering. Only bold steps towards just peace and ending the violence will protect the human life and dignity of both people."
The Holy Land church leaders group has among its members the most senior Roman Catholic leader in the Holy Land, Latin Patriarch Michel Sabbah; Greek Orthodox Patriarch Theophilos III; Patriarch Torkom II Manooghian of the Armenian Apostolic Orthodox Church; Archbishop Anba Abraham of the Coptic Orthodox Patriarchate; Anglican Bishop Suheil Dawani; and Bishop Munib Younan of the Evangelical Lutheran Church in Jordan and the Holy Land.
Additional reporting from ENI: http://www.eni.ch/