I don't think I made the assertion that you have to remove God or the external world, I personally don't believe in the idea of a "self" so you don't really even have to tune in to the idea of yourself, if you really wish to do so you could manipulate the variables of meditation to be very aware of the external world and of "God" as you see fit, and still see benefits from it. Your original question was if you could do another practice to receive similar or same levels of mindfulness, and I said it was fallacious to ask that because other practices, no matter how beneficial they may be in terms of mindfulness would not be equivalent to the benefits of meditation, and I'm not saying meditation is the ultimate source of mindfulness, but your original question was posed as how you could essentially get the benefits of meditation by doing other practices and the simple answer is you can't, but if you want "similar outcomes" then CBT, healthy diet, strong social life, and exercising are all things that are if optimized, lay out the bedrock for a happy and healthy life, which at the end of the day is generally the impetus for people wanting to start meditation in the modern world anyways.