Welcome to the forum! Akmal.
There is a difference between Kundalini Awakening and Stages of Nibbana.
Kundalini Awakening is the cleansing of the body while Stages of Nibbana is the cleansing of the mind. Although Kundalini Awakening maybe of help to the Stages of Nibbana, it is not the same as Stages of Nibbana.
To attain the Stages of Nibbana, one need to cleanse the mind by cultivating the good (alobha, adosa and amoha) and avoid all evil (lobha, dosa and moha). This is as stated in the Dhammapada verse 183.
[Sabbapāpassa akaraṇaṃ,
kusalassa upasampadā,
Sacittapariyodapanaṃ,
etaṃ buddhāna sāsanaṃ.]
[To avoid all evil,
to cultivate good,
and to cleanse one’s mind
—this is the teaching of the Buddhas.]
Your questions:
1) What is the significance of the purging process (and chakras) in the Dhamma teachings? Because purging is a reality for me and if I can get some insight into it I can really strengthen my faith in Dhamma teachings.
As stated above, these purging process has nothing to do with the Dhamma teaching, it is just a body cleansing process where the meridians that has been blocked is being cleared. In the process, you will feel the tingling sensations when those blocked meridians are being cleared.
2) What does Dhamma say about these energy sensitive people? are these Abhinaa powers?
Abhinna can only be attained if you have reached the fourth jhana (Sutta definition) or fifth jhana (Abhidhamma definition) and need to have complete mastery over these jhanas which will need to take a very long time to cultivate if you have not cultivated it in the previous life.
A good start for beginners will be to read the topic on “User’s Guide to Pure Dhamma Website” and follow the suggested flow of the topics.
You may also want to check out these sections:
3. Three Marks of Existence – English Discourses
With metta, SengKiat