Eihab, speaking as a Sikh, I think you need to understand India first before you can understand if you want to follow the Sikh Dharma. For as long as Indian history has been recorded by Indians, we have called the different paths one takes towards the truth as Dharma. HIndu is word that Persians used to describe the people who lived east of the river Indus.India-Indu-Hindu-, get it?
People think that Sikhism is a mixture of Muslim and hindu beliefs--that cannot be furthest from the truth. Abraham religions think that God is like a gardener and we are in his garden. For the garden to remain beautiful we must follow his laws, laws which he has sent with his chosen messengers, be it Moses, Jesus, Mohamed etc .
In Indian Religions or as we would say Dharmas, God is not an entity--God is Truth, Truth is God, they are the same. When a person strives for Truth, he is striving towards God, he enters a state of non suffering gained by enlightenment. When a person strives in ignorance, he suffers as one would suffer in hell and causes all around him to suffer as he suffers. A lot of Dharmas in India by the time of Guru Nanak had become too ritualistic. Guru Nanak was preaching that one should strive again for truth without mistaking empty ritual for truth. One has to be completely honest in their intent towards truth, towards God, and that can only be done upon deep reflection and meditation. Lord Buddha also asked that one should strive for truth, but his truth was that life is suffering caused by attachment to ones ego and everything around ones ego, acceptance of this fact brings one closer towards enlightenment, towards truth, towards God. The reason people think that Buddhist Dharma is atheistic is because when Lord Buddha was asked about God he kept quiet. The reason he kept quiet was because when one rids oneself of ones ego, the question becomes irrelevant.
Guru Nanak in comparison states that the truth is God, that only God exits, and ones acceptance of this fact would also cause them to arrive at Moksha/enlightenment, truth. This is at its core pure Vedic. Ask any learned Brahman or priest and they will tell you the same. The only reason why Jain, Buddhists, and Sikhs are different from modern Hindus is because they feel that their respective Dharmas are open to all people, where as the Hindus feel that only those who are born into the Brahman Caste can meditate towards the truth.
I am not sure I have explained the Sikh Dharma to the best of my abilities, please ask anything if you need further clarification.
