Mix the ingredients. In a large mixing bowl, combine the flour, water, salt, sugar, cinnamon, and raisins. Then, mix everything together at once to make sure the cinnamon and raisins disperse evenly.
Check the consistency of the dough. Use a rubber spatula to incorporate any dry areas of flour. The dough should form a shaggy ball. If there are any dry bits, add a few more teaspoons of water and mix again. The dough will be sticky.
Cover and allow to rise. Tightly cover the bowl with plastic wrap. Place it in the fridge and let it rise for 10 hours or overnight. In the morning, check if the dough has doubled in size. If not, remove it from the fridge and let it rise on the counter until it doubles.
Shape into a ball. Line a baking sheet with parchment or spray it generously with nonstick cooking spray. Gently pick up the dough and shape it into a smooth ball by pulling from the bottom to smooth out the top. Deflate any large air bubbles that have formed. Place the dough onto the prepared baking sheet.
Allow the dough to proof. Prepare a warm place for the second rise by briefly turning on your oven or placing a bowl of hot water inside it. Cover the dough with greased plastic wrap, ensuring it is completely covered. Let it rise in a warm place for about 45 minutes until puffy but not quite doubled in size. Towards the end of the rising time, preheat the oven to 425°F (220°C) with the rack in the center. Be sure to remove the dough first.
Bake. Bake the loaf for 35-40 minutes, until deep golden brown and with an internal temperature of 200°F (93°C). Cool for an hour before slicing.