Very difficult question to answer.
I am by birth a Hindu but not a mainstream Hindu. Due to excesses of Brahmins there arose in early 19th century, Hindu Reformation movements. One of these created a sub-religion called Brahmo Dharma
Brahmoism - Wikipedia (literally worshippers of formless Nirguna Brahman). It was restricted to very few educated people. We do not believe in idol worship, Vedic mantras, caste system but teachings of Upanishads and Vedanta. We have no temple and no gospel or liturgy. The Brahmos (as we are called) were also extremely accepting of West (study of English, French, German; travelling abroad; creating science laboratories; becoming mathematicians and so on .. remember this was back in 1850 or so when India was deep in grip of Brahmins ).
Thus even though I was a practising Brahmo, I was for all intents and purposes not a practising mainstream Hindu.
Unfortunately my religion died out! Reason is rather odd – because Brahmos were more educated they migrated to West (mostly USA and UK). Many became highly educated atheists (like my sister). And there was no longer sufficient momentum to keep the religion going past 1990.
Some young Brahmos like me began to feel social anxiety when they turned 18 – 20. I was not mainstream Hindu, I was not Muslim, I was not Sikh. I had no label in a country where religious labels are very important. I almost converted to Christianity at 25 (that is why I have read the Bible extensively).
For several years I read the Pali Canon extensively but found Buddhism to have contradictions that are unexplained and unacceptable (but I do not have any overall argument with Buddhism)
I would
not consider myself non-practising today. But I only believe in Vedanta philosophy (leftover of my Brahmo upbringing). At times I would visit a temple to offer puja .. but not regularly. I have a shrine with Shiva, Kali and Krishna. I do pray daily to my Hindu Ishta Devta but I would shy away from any type of orthodoxy.
Long answer. Hope I could answer your query satisfactorily.
namaste
A_B