When F. Nietzsche made a madman shout that 'God is dead', he did no more than emphasise that that transcendent 'God' was dead forever, killed by his own believers, because it was a 'God' that was now meaningless. Starting from this observation, M. Heidegger radically challenged the very concept of metaphysics and laid a philosophical foundation for the refusal to conceive of a God 'other' than human experience. From a world revolving around an all-powerful, personal and providential 'God' to a suddenly empty sky; from a reality dominated by historical religions to a world that is finally free and secular; from theism to post-theism... A true change of epoch and perspective that, as planetary humanity, stimulates, frightens and provokes us. In fact, this situation questions us: How do we seek that beyond which man needs? How to live one's spirituality in an adult and conscious way? To find a solution, reflecting on the languages of religion and spirituality is fundamental. Words in fact create and interpret reality, they define us, they help us find the right context. Indeed, language was and is central to humanity's life and search for meaning. In my talk I will examine this crisis of religious languages and how they can evolve in a post-theist perspective. In particular, I will focus on the words that we used to use and that, in spite of everything, we still use when we want to get in touch with the reality that we have been calling 'God'/Theós for millennia. For example, prayer, which is an excellent litmus test for dealing with problematic aspects that urgently need radical, albeit gradual, change. The very term 'prayer', with its meaning of 'request', 'submission' and 'dialogue' with an anthropomorphic and external 'You', must slowly be overcome, evolving towards other and more appropriate expressions such as 'meditation', 'communion', 'immersion'.