In a mixing bowl, combine warm milk, sugar, and yeast. Let it sit for 5-10 minutes until it becomes frothy.
Add the softened butter, salt, and 2 cups of flour to the yeast mixture. Mix until well combined.
Gradually add the remaining flour and knead the dough for about 6-8 minutes until it's smooth and elastic.
Gently knead in the raisins until they are evenly distributed throughout the dough.
Place the dough in a greased bowl, cover it, and let it rise in a warm place for about 1 hour or until it has doubled in size.
Mix the sugar and ground cinnamon for the swirl in a small bowl.
Roll out the dough into a rectangle. Sprinkle the cinnamon-sugar mixture evenly over the dough.