FWIW, I believe in the existence of multi-dimensional phenomena that are beyond the reach of the normal human senses and are beyond even the most modern and advanced tools of scientific observation. You can call this having 'spiritual' or 'meta-physical' belief if you'd like. I would tend to think of a "religion" as employing religious forms and behaviors--e.g., churches, rituals, chants or mantras, etc., which might be considered logistical means to focus on the mind on the inner self or potentially invoke a profound experience.
I think that as a scientist, it would be reductionistic and scientifically irresponsible to categorically dismiss the human religious/spiritual experience on account of not being able to document it, measure it or account for it in a standardized way. Such spiritual knowledge and experience cannot be disproved due to the limits of our methods of scientific observation, while some phenomena can be readily observed, if not fully understood. There are a number of phenomena that cannot be readily grasped by modern science--for example the "dark energy" that comprises the vast majority of the observable universe, the structure of the human body at the sub-atomic level, the characteristics of time fields beyond our grasp, and so on. In fact, it is even often difficult to scientifically understand a number of more mundane phenomena, such as the human mind, memory, art, culture, humor, the origin of intelligence, etc.
Hence, the scientist who categorically dismisses spiritual knowledge and experience cannot do so definitively and might actually be the one who turns out to be narrow-minded and taking comfort in widely preached dogma.