sam2 you are confusing the Karaim with Shomronim the Karaim are a sect within Judaism who do not accept Tora she beal peh and only what is written or is explained by their “rabbies”
Shomronim on the other not Jewish (descendants of those from Yehuda) but are from according to their tradition from those remained from the kingdom of Yirael _northern kingdom they had in ancient times a bet mikdash that might have had an image of a yona
today they do not have either each year according to their calendar they celebrate Korban Pesach they have Kohanim as well they number today only a few hundred.
there were karaite communities in northern Europe, as well all over the middle east.