Is ritual always a practice, or can it be a belief too? If ritual is repetition outside of what can be justified through direct experience, can ideas and opinions, as well as words and actions, be ritualistic? Would a belief in God - given the axiomatic impossibility to verify the entity directly - classify as ritual?
Till the experience of clear seeing and knowing, realizing, what ever deed by body, speech and mind is good to considered as a habitual ritual, householder Ilya Grushevskiy and interested.

Ways of belief, expecting certain happiness and release, to the extend of not knowing, not clear seeing, are rituals.

In regard of abounding the fetter of ritual toward an aspiration headed to Nibbana it requires the knowledge of the path through realization. Relaying on this, it's also again practiced as ritual (habitual) but no more destined toward anything else as well as raw rituals not headed toward the aim have been abounded.

The same, of course, would count also for the path into the Brahma-realms, if realized once.

To possible understand the underlying point as well: believing is an action (mental), a practice, as well, and the foremost in becoming also signs and physical deeds, rituals. Usually the word ritual is used for practice that would not really cause the desired effect (i.e. actually: mind is one, sign, physical another). Sometimes ritual refers also to holding on certain actions by signs and deeds although the mind might not be directed at it's purpose, perceived as habitual only outwardly.

(Note that this gift of Dhamma is not dedicated for trade, exchange, stacks or entertainment but as a means to make merits toward release from this wheel)