Dasam Granth on Mahadev

In Dasam Granth, Mahadev(of Hindus) is not considered as Supreme being but a human being who is a Yogi who is dweller of Himalayas.

In Chopai, Mahadeva(of Hindus) and Sada Shiva are two separate entities and Sada Shiva is designated for Nirankar only. It states ਮਹਾਂਦੇਵ ਕੌ ਕਹਤ ਸਦਾ ਸ਼ਿਵ ॥ ਨਿਰੰਕਾਰ ਕਾ ਚੀਨਤ ਨਹਿ ਭਿਵ ॥੩੯੨॥.

In Hinduism, Mahadeva is primary diety, also called Shiva by Hindus and considered as Supreme God. Mahadev is usually worshiped in form of Ling.

Bachitar Natak

Dasam granth on Mahadeva

ਮਹਾਦੇਵ ਅਚੁੱਤ ਕਹਾਯੋ ॥ ਬਿਸਨ ਆਪ ਹੀ ਕੋ ਠਹਿਰਾਯੋ ॥
महादेव अचु्त कहायो ॥ बिसन आप ही को ठहिरायो ॥
Mahadeo (Shiva) was called Achuta (Unborn), Vishnu considered himself the Supreme.

ਬ੍ਰਹਮਾ ਆਪ ਪਾਰਬ੍ਰਹਮ ਬਖਾਨਾ ॥ ਪ੍ਰਭ ਕੋ ਪ੍ਰਭੂ ਨ ਕਿਨਹੂੰ ਜਾਨਾ ॥੮॥
ब्रहमा आप पारब्रहम बखाना ॥ प्रभ को प्रभू न किनहूं जाना ॥८॥
Brahma called himself PaarBrahma, none of above comprehend the Lord.8.

Akal Ustat

ਦੇਵਨ ਕੋ ਦੇਵ ਮਹਾਦੇਵ ਹੂੰ ਕੇ ਦੇਵ ਹੈਂ ਨਿਰੰਜਨ ਅਭੇਵ ਨਾਥ ਅਦ੍ਵੈ ਅਬਿਨਾਸਿ ਹੈਂ ॥੧੦॥੨੬੨॥
देवन को देव महादेव हूं के देव हैं निरंजन अभेव नाथ अद्वै अबिनासि हैं ॥१०॥२६२॥
He is the God of Gods and God of Maha deva, He is Transcendent, Indiscriminate, Non-dual and Immortal Lord. 10.262.

ਦੇਵਨ ਕੇ ਦੇਵ ਮਹਾਦੇਵ ਹੂੰ ਕੇ ਦੇਵਨਾਥ ਭੂਮ ਕੇ ਭੂਜਯਾ ਹੈਂ ਮੁਹਯਾ ਮਹਾ ਬਾਲ ਕੇ ॥ (Bachitar Natak)

Kharag Singh and Lord Mahadeva

Khadag Singh vs. Mahadev,Ganesh and Kartikey

In story of Kharag Singh fighting with Krishna, Mahadev was beaten badly by Kharag Singh including his two sons, Ganesha and Kartikeya.

Rudra Avtar - Rudra vs Mahadeva

Main article: Rudra Avtar

Rudra in Adi Guru Granth Sahib

ਰੁਦ੍ਰ ਧਿਆਨ ਗਿਆਨ ਸਤਿਗੁਰ ਕੇ ਕਬਿ ਜਨ ਭਲ੍ਯ੍ਯ ਉਨਹ ਜ ਗਾਵੈ ॥
रुद्र धिआन गिआन सतिगुर के कबि जन भल्य उनह जो गावै ॥
With Rudra's attention and the spiritual wisdom of the True Guru, says BHALL the poet, these may be counted.

Adi Granth Sahib covers the concept of Rudra Dhyaan. Every living being's surt/dhyaaan (or attention) can be directed in two ways, one towards one's body (outer world), and the other towards one's own self (source of attention). As long as our attention stays on our body only, and we loose connection with our self, we are incomplete (half or daal as in Gurbani). That is why we remain tense, confused and make wrong decisions. But those who are complete (The one as in Gurbani), their attention is focused on the source of attention itself (self) and thus, they are immune to any influence of outside world such as vices. Such a one-mindedness and focus is called Rudra Dhyaan. From such a dhyaan, the thoughts that sprout are all under divine hukam (and are not self-conceived). Consequently, Hukam itself is called Rudra.

In Sikh Thought, Rudra is a qualitative name of Supreme Command(Hukam).

Rudra/Siva versus Mahadev

In Dasam Granth, Rudra and Shiva are generic terms while Mahadev is the name of one person, whom mistakenly people call Rudra or Shiva.

In Gurmat Philosophy, Mahadev was a Yogi who was dweller of Himalayas. In Hindu Myth, Mahadev is also called Shiv or Rudra but in Gurmat philosophy, Shiv term does not comes for Mahadev, because Shiv is Nirankar(Formless). In Chopai, Guru Gobind Singh cleared it as: Mahadev ko kehat sada shiv, nirankar ka cheenat nahin bhiv. In History, people give person the name whom he worship as Mahadev was worshipper of Shiva, he is also called Shiva, like Nanak was worshipper of Guru (Shabad Guru - The source of wisdom), he is also called Guru as Guru Gobind Singh said aad ant ekey avtara, soyi guru samjheyo hamara. From content of composition of Rudra Avtar, it is clear that Mahadev and Shiva/Rudra are seperate entities. Hence, Dattatreya is not considered as avtar of Mahadev.

• Whom people calls Shiva was not able to know his end as he practiced yoga for many Years.

• Here Guru Gobind Singh give a strong condemnation to following characters of history: