Is it obligatory to respect the words "El" and "Ismail" given that "El" means "God" in Hebrew, and have I committed a sin by cutting the word "Israel" and discarding the part that contains "El"?

Names of Prophets must be respected. "And whoever honors the sacred rites of Allah - it is better for him." (Qur'an 22:30) A Muslim should respect all written text. However, it is not forbidden to handle names of Prophets unless they are accompanied by something that indicates they belong to a Prophet. Preserving these names by tearing them into small pieces is permissible. It is not obligatory to meticulously check papers to ensure they are free of God's name, in order to avoid hardship and difficulty.