Is the Arab-Israeli conflict about religion?
No. Religion is a very small part of the war and is often used (incorrectly) to label Israelis and Arabs since most Israelis are Jewish and most Arabs are Muslim. However, there are many Muslim Israelis and Christian Arabs and Christian Israelis.
For a discussion of the other numerous causes of the Arab-Israeli Conflict, see the Related Question.
People are not in conflict with ideas, they are in conflict with other people who have opposing ideas. Religious conflict in particular is usually characterized by one religion conflicting with another religion, rather than by man vs. religion. Although there are atheists who oppose the idea of religion in general. That has generally been an intellectual debate, rather than a conflict.
Religion can be a source of major conflict between country and people when there is a forced religion by the state. For example, if Canada designated a single religion for our country and all other religions were not allowed to be practised, there would be conflict between the other religious groups and the state.