Zen is not a moral teaching, and as it is without dogma, it does not require one to believe in anything. A true spiritual path does not tell people what to believe in; rather it shows them how to think; or, in the case of Zen - what not to think.
Zen Buddhism, like a taste or a smell, is a practice that needs to be experienced, not a concept to understand.
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The practice of Zen meditation (Zazen), is the core of Zen Buddhism and it’s a way of vigilance and self-discovery which is practiced while sitting on a meditation cushion. It is the experience of living from moment to moment, in the here and now and also how Gautama got enlightened and became the Buddha.
Zazen is an attitude of spiritual awakening.
Due to the wide variety of practice methods, and the westernization of the term Zen, thanks to popular fiction and cultural figures, many people aren’t quite sure what Zen means.
Nonetheless, the continual evolution of Zen, as well as its practice and impact, is due to the vague and personal nature of the concept itself. However you choose to involve Zen teachings and beliefs in your life, the end goal is the same – enlightenment and a more self-aware existence.