Everything evolves. This is especially true of spiritual conceptualizations. Interestingly, the major religions that have influenced the world are based around a divine incarnation (Horus, Krishna, Buddha, Christ) or a prophet (Abraham, Moses, Sri Sankaracharya, Muhammad, Sri Ramakrishna). There are 6 major, current religions: Hinduism, Judaism, Taoism, Buddhism, Christianity and Islam. There are many archaic religions (Egyptian, Norse, Zoroastrianism, Greek, Roman). If you look at the ontological contents in comparative religion, there are many similarities, alongside many differences. There is an abundance of Trinities, from Isis/Osiris/Horus...Vishnu/Divine Mother/Krishna...Yin/Yang/Dao...Sangha/Dharma/Buddha...Father/Holy Spirit(Virgin Mary)/Christ. There are core absolute moralities. Each has a core creative principle (Love, Love, Love, Love, Love, Love). There are descriptions of the steps one takes to reach higher, spiritually, and become more enlightened. Some earlier systems are polytheistic. Some are mixed, they are so broad in their protestant interpretations (Hinduism).
There is an evolution in thought, both within a particular religion, and between the religions. This thought is in the realm of psycho-spiritual magic (chants, rituals, prayers) as well as fundamental conceptualizations of creation and our place within it, where the understanding of the performance of the psycho-spiritual magic is intimately tied into the conceptualization of creation and our place in it.
Each forms a complete, bounded, describable system. The fact that a particular system of religion is describable underscores the fact that while they each provide a complete description of spirituality, they are not the only way to describe the infinite. In fact, each religion states that the real Truth is indescribable. This is in effect an admission that a particular religion's description is not the only valid one. And so all religions are true.
The advent of "aliens", more advanced than the mass of the disbelieving humanity, is going to be quite a shock to the system. Every one of the 6 major, current religions describes the evolution of the system, and the people within it.
Sheep on the right and goats on the left. Sucks to be a goat...been there, done that. Keep an eye out for that silver Hearst.