On a cutting board, mash the garlic cloves with 1/4 teaspoon of salt to a smooth paste with the side of a knife, then add this to the processor along with the chickpeas, red bell pepper, crushed red pepper, tahini, water, 4 tablespoons of the lemon juice, 2 tablespoons of the olive oil, cumin, and pepper and process until smooth, stopping to scrape down the sides as needed.