According to Osho, 'spirituality' is a dualistic stance that splits reality into matter and spirit, creating inner conflict and lower consciousness, whereas 'religiousness' (from religio, to bind together) celebrates the oneness of existence—body, mind, and soul as an organic whole. Religiousness unites Zorba and Buddha within, fosters harmony, and leads to higher states of consciousness; therefore, drop all divisions and cherish what unites.
Spirituality separates body and soul, but religiousness brings everything together into one, so you feel whole and peaceful.