Hare Krishna.
Here are some further statements from the Vedas.
YOU WROTE: Surely God does not establish religion - only Man does, and in this way, all religion is subject to the imperfection of Man.
** This would imply that in the past nobody attained perfection of love of God.
** REASON: the scriptures and religions are imperfect
** What a God, He is leaving us to rot in the material world speculating what is spirituality.
** Looks like he is a hedonist, He likes to see us suffering in this material world
** He let us here to be eternally doomed in the material world.
** FORTUNATELLY THIS IS NOT SO.
** Your above statement reflects a luck of knowledge of the Vedic literature.
** There are many Incarnations of God like Krishna, Rama, Narasimha etc. who come to reestablish the eternal pure religious principles - bhakti or devotion (also translated as devotional service because bhakti is a practical activity and not only an imagination)
** to accept that God has a spiritual form and that when He comes in this earth planet makes Himself visible for us, needs a certain level of faith
** faith that God can do anything He likes
** our speculations cannot stop Him to come
** Vyasadeva who wrote down the Vedic wisdom, before 5000 years ago, is one of the incarnations of God
I could go on and on on this topic but I rather would like you to ask some question so I will answer accordingly.
Q. are you equating personal spirituality as "religion"?
** the Vedas say as many people so many philosophies.
** the Vedas also describe two possible ways to God realization
** the ascending - when people try to understand and attain God by their small capacity of intelligence.
** Because they have imperfections (the four mentioned before) most of the time they do not come to the proper conclusions who is God and how to attain Him
** the Vedas say out of thousands of such speculators one might come to the point to admit the greatness of God and the value of Vedic literature (what includes the understanding that the the perfect spiritual knowledge is given by God)
** So. such person accepts the second method of God realization - the descending method
** it is called descending method because the spiritual knowledge and the method of attaining God realization comes from the most perfect person God Himself.
** to understand this needs a certain level of purity, piety and faith in God
** By studying the Vedas one can realize that pure pure spiritual knowledge can come only from God Himself
** it is valuable at all times places and circumstances
** it is the knowledge that describes and explains the eternal religion of the soul - sanathana dharma
Q. Seems like there may be a confusion of the semantics here, as "religion" is usually regarded as an organised form, yes? And all organised forms are subject to the imperfections of Man?
** this depend what certain group follows, the ascending or the descending method
Q. Or will this be a situation where one specific religion claims complete and perfect transmission of God's Will to one type of scripture, and therefore other types of scripture are wrong?
** in practicing ascending method of religion people might come to many similar points of knowledge like that given by God
** thus the Vedas say that they can even realize the Brahman-light feature of God
** but to realize other features of God, IOW to fully understand God is not possible by their mental speculation
** you can also naturally conclude that of the two types of knowledge mentioned above one is more perfect then the other.
** If one does not want to accept the descending method, the Vedas encourage one to at least practice the ascending method.