The mixture is some discussion Here are:
1) Is it possible spirituality without religion?
2) Buddhism, a religion? Or spiritual movement?
3) Our image of God.
 4) responses are not reasonable or not supported by powerful argument. (rationality).
5) benchmark and benchmark for us to judge / Value judgment must correct argument (rationality) is.
I will elucidate first claim:
A) Religion:
World Religions, two major features are: 1) institutional, and 2) history.
World Religions relationship between man and God in the five realm of psychological change:
1) beliefs, doxastic, cognitive, 2) emotions, emotive, affective, 3) voluntary/conative (These three realm are subjective), 4) speech, and 5) act (the tworealm are objective).
For example, when we say: I believe in God (first realm), I believe in God (second realm), worship GOD (third realm), invocation God (the fourth realm), and prayer and fasting (fifth realm).
But the main problem of institutionalized religion is?
Institutionalized religion, incompatible with rationality.
What is rationality?
1) independent investigation of truth, 2) full commitment to reasoning.
In the event that, institutionalized religion, to "speak", "claim" and so on, a particular person (eg religion) is committed not to correct argument.
In other words, institutionalized religion, its owner knows the truth, and rationality, seeking the truth.
Moreover, institutional and historical religions, rituals and rites, and certain truths, which does not gather with rationality. Institutional and historical dimensions of religious ritual, represents collective aspects of religions. In other words, religionists, finally, with a series of rites and rituals, collective, the owner of truth (the suspects themselves) are.
From prehistoric times to the present, religion has been a central part of human experience and culture. Religions are thought to have existed in all times and societies.Traditionally the term religion was used to refer to all aspects of the human relationship to the Divine or transcendent — that which is greater than us, “the source and goal of all human life and value”.More recently, scholars have started to understand religion as activities and a way of life: “the fashioning of distinctive emotions; of distinctive habits, practices, or virtues; of distinctive purposes, desires, passions, and commitments; and of distinctive beliefs and ways of thinking,” along with “a distinctive way of living together” and a language for discussing “what they are doing and why”.
What is spirituality?
Apparently, unlike religion, spirituality, institutional and not a historical.
Although the five realm of spirituality also creates a psychological transformation, but primarily personal (individual) and not collective, the second rationality is retractable. That could be a correct argument for the independent investigation of truth, speak of spirituality and defense (where possible rational defense).
Over the last several decades the term spirituality has entered the common language as an alternate way to describe our search for the transcendent. In its original English meaning, “spiritual” was a term used to contrast church life with “worldly” or materialistic ways of being . In the 19th century, “spirituality” was not a commonly used term and “Spiritualism” referred to contact with spirits and other psychic phenomena. In contemporary usage, the term has a number of common meanings , and definitions in the scholarly literature also vary. These differences reflect the fact that spirituality is a broad term encompassing multiple domains of meaning that may differ among various cultural, national, and religious groups . Today the term is often used to denote the experiential and personal side of our relationship to the transcendent or sacred . Those who use the term in this way typically contrast it with religion, which they define narrowly as the organizational structures, practices, and beliefs of a religious group . Theologians and religious practitioners, on the other hand, tend to prefer definitions that draw less of a strict division between religion and spirituality. In their eyes, spirituality is the living reality of religion as experienced by an adherent of the tradition.
 argues that spirituality encompasses 4 themes: (1) a source of values and ultimate meaning or purpose beyond the self, including a sense of mystery and self-transcendence; (2) a way of understanding; (3) inner awareness; and (4) personal integration.
The last characteristic is particularly important. Spirituality has
an integrative and harmonizing function that involves (a) our inner unity and (b)
our relationship and connectedness with others and to a broader reality that powers
our ability to be transcendent .
Apparently, the fourth component, can be greatly with "mental health" familiarize one.

Conclusion:
Perhaps to be clear here which Buddhism is a religion,
Religions can not be compatible with rationality. (Especially which themselves owner knows the truth).
Spirituality, personal / individual. Spiritual man "seeking the truth". And with more rationality retractable.