Do Hindu scriptures say that Rama is the Supreme God?
I would like to share my answer to a Quora question. The answer tries to reject some of the misconceptions people have about Lord Rama. Though Rama has been established as the Supreme God in most Hindu scriptures, some individuals continue to propagate the false viewpoint that he is not divine.
If a human being does not want to believe that Lord Rama is Purna-Brahman — and all-knowing, — no literature support for this fact will be sufficient for him or her. On the other hand, if someone has developed faith, he or she will unambiguously recognize Rama’s divinity in all authentic versions of the Ramayana — including those written by Maharishi Valmiki, Maharishi Ved Vyas, and Goswami Tulasidasa — and in other devotional Hindu scriptures. So in the end, it is Rama (God) himself — the Real Doer — who decides if Rama will be perceived as the Divine by an individual soul (jiva) or as a mere human being or as an allegory. This is where faith and trust on Rama become important.
Unfortunately, today we do not have access to many scriptures in their original forms ; many scriptures appear to have later additions in them with internal logical inconsistencies or errors. Because we did not have a printing press in earlier times, it came down do hand-written manuscripts being transferred from generation to generation and memorization by later scholars. This is where unnecessary words may have been inserted, in spite of good intentions.
What can be a solution to deal with this situation? Rather than developing a My favourite scripture is perfect or My favourite scripture is better than your scripture kind of paradigm, we should learn to absorb what is useful in any scripture and skip what is not relevant for us. Moreover, equally importantly, we can also request Rama to directly guide us towards himself. In Hinduism, Rama’s being the Supreme God is not solely a scripture-dependent concept; it is more dependent on the personal experiences of devotional saints who have met him in person  and the experiences of commoners, some of which have also been documented in scriptures.
 Some relatively newer scriptures like the Bhagavad Gita may have had a higher chance of reaching us in their original state or with minimal modifications. In North India, the Ramacharitamanasa was more recently written and may have reached us in its original state.
 For many exclusive devotees of Rama like Sri Ramananda, Goswami Tulasidasa, Saint Thyagaraja, and Samarth Guru Ramdas, Lord Rama happens to be the source of Lord Vishnu and all incarnations. For many Vaishnava saints like Mirabai and Surdas, Rama is an equal of Krishna; for some, he is an incarnation of Vishnu. In spite of the superficial differences, Rama has been considered divine by all Vaishnava saints.