By the standards of the Law of Return if your grandfather was a Jew you may be considered culturally a Jew, and convert back to being a Jew eligible for immigration. The Israel government determined the standard as to who os a Jew not you.
You have ignored the specifics of the reference I cited. You have NOT provided a reference to the contrary.
Israeli citizenship law - Wikipedia
Voluntary acquisition
Any Jew who immigrates to Israel as an oleh (Jewish immigrant) under the Law of Return automatically becomes an Israeli citizen.[72] In this context, a Jew means a person born to a Jewish mother, or someone who has converted to Judaism and does not adhere to another religion. This right to citizenship extends to any children or grandchildren of a Jew, as well as the spouse of a Jew, or the spouse of a child or grandchild of a Jew. A Jew who voluntarily converts to another religion forfeits their right to claim citizenship under this provision.[73] At the end of 2020, 21 percent of the total Jewish population in Israel was born overseas.This absence of legal clarity was tested in the 1962 Supreme Court case Rufeisen v. Minister of the Interior in which Oswald Rufeisen, a Polish Jew who had converted to Catholicism, was ruled to have no longer met the criterion of being a Jew on his religious conversion.[44] Converting to any other faith is considered to be a deliberate act of dissociation from the Jewish people. The Supreme Court elaborated on this in the 1969 case Shalit v. Minister of the Interior, when it ruled that children of non-practicing Jews would be considered Jews. Unlike Rufeisen, the children took no action that could be considered dissociating. However, this ruling created a separation between the Jewish religion and the legal interpretation of membership in the Jewish people that required legislative clarification.
In 2018 Israel passed the Nation-State Law further defining Israel as specifically a Jewish State for Jews.
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