I think it is worth saying, as Aupmanyav was the first to strike, that 'Hindus' like Aupmanyav, often jump on other Hindus, in this case a non-Hindu asking Hindus about common Hindu concepts that Hindus believe, and I find it disruptive. In other threads Sayak has jumped on me for "peddling spiritualism" when I just talked about Hindu theories on creation, such as how blind matter is guided by intelligence or the Hindu argument from design. I think it vitiates the atmosphere. It would be like me claiming to be Christian and jumping on other Christians for common Christian beliefs like the existence of Jesus etc.
I think we need to come up with some policy regarding these self-identified "atheist Hindus" to not disrupt or attack other Hindus for professing common Hindu beliefs. It just ruins the atmosphere in my opinion. I think they themselves should stop themselves from making remarks like they do, when they know clearly these are common Hindu beliefs.
Anyway, coming to Kundalini. I have not a Kundalini experience myself(though I had something very close, PM and I will tell you about it) but we've all had that spine tingling feeling, where it feels like currents of electricity shoot up the spine. It usually happens during euphoria, sometimes during orgasm or when one feels a great sense of inspiration or truth. Well, a Kundalini experience is like that x100, it can lead to extremely heightened states of consciousness. A proper Kundalini experience is transforming, because it completely changes the energy system of the body. I recommend checking out a guy called Gopi Krishna, who had a Kundalini experience in his early years, and then went through a terrible ordeal trying to contain it. He has written about it in his book 'Living with Kundalin' and you can watch his video talks on youtube. This man is the real deal and speaks from experience. He came up with his own theories on how Kundalini is an evolutionary mechanism. When more Kundalini energy is released it leads to the evolution of a species. In humans, we can consciously control that mechanism, and effectively control and quicken our own evolution process.
However, Kundalini is not something you directly mess with, at least not without supervision by a Guru. Kundalini will automatically rise by any meditation or spiritual practice. Hence, the term "Kundalini sydrome" or "spiritual emergency" was introduced into psychiatry, when a lot of people who started Yoga and meditation practices started displaying the same symptoms. In Hatha Yoga, Kundalini can be directly made to rise, by doing a series of exercises like asanas, pranayama, mudras and bandhas, which directly force the change of the energy dynamics of the body. It is called 'Hatha' because Hatha means to force. Hence, you are literally forcing the Kundalini to rise. This requires preliminary purification practices though(like shat kriyas, nadi shodhana) as you prepare your body for the Kundalini otherwise it can be dangerous. A common metaphor is this: If you have a 10 watt bulb but a 1000 volt current, you will blow the bulb, but if you have a bulb that can take 1000 volts, you will be fine.
I would recommend you take up the preliminary purification practices.
I think my reply probably addressed your question the most directly.