There is just one concept only, that is the strange attactor to my already established thoughts, that has drawn me to Hinduism, other than the great food and Ayurvedic household goods :P
Jainism, Sikhism and Buddhism share the same Om (although many meanings shall exist), however my lifestyle choices are in line closest to Hinduism.
At the same time I am still an atheist and I do not worship any idolship any way beyond for benifit of a mnemonic device. I consider Buddhism to be the highest level of Hinduism, and that I am not ready.
In Hinduism, the study of Lord eventually leads one to deeper and deeper meanings behind the Om. And Buddhism shares with it some of the deeper meanings.