[Note – this is a very live topic in Latin America, and I wrote this for the church there. I also offer it for the English-speaking church].
Every time I write that salvation is for all who believe the gospel; that Gentile believers are not obligated to be circumcised or observe the 613 laws of the Torah; or that we can keep our Gentile names (as Paul, Luke, Silvanus, and so many others did in the early church); or any number of other basic truths of the gospel, someone, inevitably, writes in and says:
But wait! Salvation is of the Jews! It says so in John 4:22!
These people rarely specify what they think this verse means, or proves, or whether it indicates that Gentiles cannot be saved. It seems to be used more as a mantra than as a clear statement of intent.
What do my readers think that Juan 4:22 really means, and why don’t they say so openly and clearly? Why speak indirectly, as does this website: 
“Salvation is from the Jews”. As you can observe, salvation does not come from Catholicism, nor does it come from evangelical Christian churches, neither through the Jehovah’s Witnesses, and much less does it come through Muslims, Adventists, or Mormons. The Messiah Himself, Yahshua [sic] , tells us that Salvation comes through the Jews.
The author implies that you cannot be saved in the Roman Church, nor in the evangelical churches, but only through…what? Converting to Judaism? In another place they urge Gentiles to return to their “Jewish roots”. It’s all very vague. By the way, I don’t believe that anyone is saved by going to meetings of the Catholics, evangelicals, Jehovah’s Witnesses, Muslims, Adventists, Mormons, nor of Messianic groups.
And note that he switches the terms around: Jesus said that salvation comes from the Jews, but it gets changed somehow to “through” the Jews.
I will suggest that those who say that “salvation is only for the Jews” or “only for those who submit to the messianic rabbis of today” misinterpret the meaning of John 4:22; neglect its historical and theological background in Second Temple Judaism; and also are not informed with regard to the actual teachings of rabbinic Judaism for the past 2000 years.
1. Many Messianic teachers of today misunderstand John 4:22
The flow of John 4:22
Readers of my blog will know me, but I will also add that I serve as a consultant for an organization that translates the Bible into the world’s languages, and that the gospel of John is one of our current projects; that I have taught the gospel of John for many years, based on my own research; that I teach among other topics Second Temple Judaism on the graduate level. Therefore I provide my own translation of the passage in question. I also wish to point out that I am looking at John 4 in the original language – not in some faked “Hebrew” original that everyone talks about – but which no-one seems able to show us – but the real Bible text as represented in the earliest available manuscripts. 
Aerial view – the ruins of the Gerizim temple, the “mountain” where the Samaritans worshiped
Why don’t we begin at the beginning, and study precisely what the Messiah told the Samaritan woman? (more…)