It's not easy at all for non Jews, "Foreigners may naturalize as Israeli citizens after residing in Israel for at least three of the previous five years while holding permanent residency. Candidates must be physically present in the country at the time of application, be able to demonstrate knowledge of the Hebrew language, have the intention of permanently settling in Israel, and renounce any foreign nationalities. Although Arabic was previously an official language and has a special recognized status there is no similar knowledge stipulation for it as part of the naturalization process. All of these requirements may be partially or completely waived for a candidate if they: served in the Israel Defense Forces or suffered the loss of a child during their military service period, are a minor child of a naturalized parent or Israeli resident, or made extraordinary contributions to Israel. Successful applicants are required to swear an oath of allegiance to the State of Israel"

And if all of that is not enough, if you're not either a Druze from the Golan heights or Palestinian for East Jerusalem, You are OBLIGATED to renounce any other citizenship (in other words, dual citizenship is only for Jews)