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My grandmother (mother's side) is 100% Jewish and even living in Israel. As far as I know, that makes, me a Jew, too. But it feels a little bit strange to say that I am Jewish just because my grandmother is.
If someone with one Jewish grandparent - maternal grandmother - and no Jewish upbringing goes to a rabbi and asks for help in living as a Jew, would the rabbi find that strange? Would the person really be accepted as a Jew, right off the bat?
Among those Rabbis that I know, if/when they are approached by someone who wasn't raised as a Jew but has a Jewish maternal grandparent, they welcome them with open arms as Jews, albeit Jews who have been estranged from their own religion. I have known this to have occurred on multiple occasions (although I was never personally involved in any).
It may be useful here to distinguish between various forms of "Jewishness". According to halakha, that is, Jewish Law, such a person is completely Jewish in the sense that person is bound by Jewish Law (as opposed to Noahide Law) and if that person is a woman, her children retain that status as well.
However, if someone doesn't identify with the Jewish people, then they can lose some of their "Jewish rights". This includes a share in the afterlife as well as in the good fortune of the Jewish people that is promised to them by the Prophets (Rambam, Hilchos Teshuvah 3:11). This is likewise true of Jews who don't believe in the 'Jewish beliefs' (Rambam's Introduction to Perek Cheilek). There are also several laws in the Torah that differentiate between Jews and non-Jews (such as the fact that shehita, ritual slaughter, can only be done by a Jew), and many of those laws only consider those who personally identify with the Jewish faith to be Jewish. This loss of "Jewish rights" is applicable equally to a person was raised in the most traditional Jewish family and someone is merely Jewish by virtue of having a Jewish maternal grandmother, once (s)he could no longer identifies with the Jewish faith.
But, to re-emphasize, such a person is still considered a Jew regarding his/her own legal status (i.e. that person is considered bound by Jewish Law and, if female, will have Jewish children), so once/if such a person decides to identify as a Jew, that person will be 100% Jewish in every respect, and not require any form of conversion ceremony.
No, the rabbi wouldn't find it strange. & Yes, he would accepted you at the spot as 100% jewish.
And I can tell you from my own personal experience they would be even very happy!
I was in a similar situation a decade ago. The Rabbi of the orthodox shul looked into my background and accepted me and made me feel welcome. You never know where such things lead and I'm now on the shul's board and am an assistant gabbai.
You're halachically Jewish and will be recognised as such. What you do with that is up to you.
The answer may depend on the movement or denomination with Judiasm. I am Jewish. My daughter chose a different religion for herself. Her daughter, who was not initiated into any religion by her biological parents and who I legally adopted this year, has asked to follow my religion - to be Jewish. We approached a Reform rabbi after visiting a couple of times, and were told she would need to be converted, even though she is my biological granddaughter.
