I did not present the OP to have a debate, but rather to try to better understand where the reduction of importance to 'mere' came from. To me and many others, the reality of our Gods is just a given, as is reincarnation, karma, dharma, etc. It's not really open to debate within the Hindu paradigm. So with that in mind, if you guys want to debate this, please start another thread. I do recognise that there are some Hindus that don't believe in at all. (Like Aup, for example, who's a declared atheist.)
For some background, I have attended several functions that were held by a local priest (and a friend of mine) not of my sampradaya who, in his explanations, uses 'symbolises' a lot. At a fairly recent one, I snuck up to him after the function, and said, 'Some of us believe they're real, you know," to which he responded, 'Yes, I know," but I suspect that was just to appease me. He is a friendly guy, after all. But he's also very much leaning to universalism, and the idea that all religions are the same, so he probably thinks it all just manifestations of that One Supreme. And that's all good, but it's watered down Hinduism, to say the least.
But without going into any specifics, as that is forbidden in my sampradaya I KNOW from a mystical POV that they're real. Heat is real because you can feel it. it's like that, and some days, it's hard to distinguish the difference.