This is a selective reading of few verses in the Guru Granth Sahibji, which is a very large literature.

Sikh Gurus often used the most popular names of God in their times since as per Sikhism all names of God are sacred. There are major differences from Hinduism:

1. No belief in Avatars. Sikh Gurus have spoken strongly against the idea of Avatars.
2. No deity worship i.e. idol worship is strictly forbidden.
3. Caste system is refuted.
4. Many Hindu traditions like offering to Pitrs, pilgrimages, fasting are discouraged.
5. The deities if at all believed in are said to be subservient to the one true God.

There are verses which Guru Arjan Devji has spoken where the names or Rama or Govind are explicitly taught to be not the names referring to deities but the God who rules over them. I am not quoting them here since the Granth is considered very sacred to openly quote without good reason.

There are numerous differences to speak. If you are interested, please go over the Sikh Religion by Max Arthur MacAuliffe , there are many volumes on Sikhism by this respected author, its not a small topic. Here is one reference of volume 1. http://www.sacred-texts.com/skh/tsr1/index.htm

Having said this, the Sikh Gurus believed in Dharma and sacrificing even their lives and families for righteous causes. Hence they have supported the Hindu cause and freedom to practice ones religion and some verses you selectively quoted indicate this because in those times Hindu innocents were extremely oppressed. Similarly they believe irrespective of religion devotion matters most to God. Hence the teachings of Bhagats which include Hindu and Muslim saints have been incorporated in the Guru Granth Sahibji.

So my humble view is to consider Sikhism as a unique religion in its own right and celebrate the common points with Hinduism without trying to downplay its great unique teachings.

This is a selective reading of few verses in the Guru Granth Sahibji, which is a very large literature.

Sikh Gurus often used the most popular names of God in their times since as per Sikhism all names of God are sacred. There are major differences from Hinduism:

1. No belief in Avatars. Sikh Gurus have spoken strongly against the idea of Avatars.
2. No deity worship i.e. idol worship is strictly forbidden.
3. Caste system is refuted.
4. Many Hindu traditions like offering to Pitrs, pilgrimages, fasting are discouraged.
5. The deities if at all believed in are said to be subservient to the one true God.

There are verses which Guru Arjan Devji has spoken where the names of Rama or Govind are explicitly taught to be not the names referring to deities but the God who rules over them. I am not quoting them here since the Granth is considered too sacred to openly quote without good reason.

There are numerous differences to speak. If you are interested, please go over the Sikh Religion by Max Arthur MacAuliffe , there are many volumes on Sikhism by this respected author, its not a small topic. Here is one reference of volume 1. http://www.sacred-texts.com/skh/tsr1/index.htm

Having said this, the Sikh Gurus believed in Dharma and sacrificing even their lives and families for righteous causes. Hence they have supported the Hindu cause and freedom to practice one's religion and some verses you selectively quoted indicate this because in those times Hindu innocents were extremely oppressed. Similarly they believe irrespective of religion devotion matters most to God. Hence the teachings of Bhagats which include Hindu and Muslim saints, and those aspects which are in consonance with Sikhism, have been incorporated in the Guru Granth Sahibji.

So my humble view is to consider Sikhism as a unique religion in its own right and celebrate the common points with Hinduism without trying to downplay its great unique teachings.