u have to give up that stinky pickled fish during lent, otherwise, you should be fine
dill-flavoured crisps, i think, are lentern (every ikea has them, i assume they are some sort of national food!)
u will have to get used to always being the first person to arrive at church, and you'll probably kiss more people than you're used to at pascha, otherwise you should be alright.
i have friends from church who have relatives in sweden, if you like i can ask them how swedish they are
the egyptians and sudanese eat even stinkier fish (the method of preservation, i think, is similar to preserving mummies, and it smells just as good) so i think u will fit in just fine