ya ...u r partly right ..
Our religion is the most ancient one ...There are as many as 1000 sects in Hinduism..Like Shaktas(they worship Mahadeva Shiv),Vaishnavs(worship Lord Vishnu ) etc .
Yet these all sects has lived in India in harmony ..Becauze each sect admits that like different rivers follow different path before merging into the same ocean , people preaching through different sects ultimately attain to the same TRUTH or Parabrahm or Brahman . Here comes the concept of one's 'Ishta'..(the right path suitable to one's test & inclinations to attain the ultimate realization about one's true SELF..).So someone like to worship/meditate Siva or Visnu or Mata Rani or Ma Kali or any other gods..Actually it's the path for Sakar Upasana (meditating on a form like MR/Vishnu/Shiva etc .. It's easy to meditate on a form ..most people follow this path. As you have mentioned , some sects worship the Brahman without any attributes or Form .This called Nirakara upasana. But ultimately both come to the same resilt/realization) .
Here Vaishnavi's Ishtadevi is Mata Rani . One can pray for anything to my Ishta Devi/Deva regardless of nature of prayers.
Actually it's not possible to write everything..I can tell you if you read Gita meticulously , you will be able to grasp some grand ideas of Hinduisim which was preached about 5000 yrs B.C. The essence of our religion is told in Gita .
In MKC , the way of portraying multiple gods or the theme that Vaishnavi have to gain confidence fron other gods is totally wrong .Creatives have written this to increase TRP .
