Dear Harvir,
I felt compelled to reply and give my input, althought I rarely use this forum nowadays.
I am from the UK, and what you would call a GORA. I find it highly irresponsible when people blame western culture for the faults in their own society. Let me tell you that plenty of white people are not too pleased with the way society is going either. I come from a non-religious family, my parents have still some fairly traditional values when it comes to, for example, sex.
Your post seems to reveal an identity crisis. I can understand that. I think a LOT of people are confused about identity in Britain, including whites (and that is why groups like the BNP are rising among the white uneducated classes). But let me correct you on something here, it seems you think Punjabi culture = Sikh values. I am not here to denegrate anyone - in fact I am very vocal about the ills in white British society, but you know this is not the case. The vast majority of Punjabi Sikhs drink alcohol (or are white people to blame for that?), including sardars. Amrit and long hair are worthless without constantly striving to become one with Waheguru and become a better person, I even have stories of Amritdhari people that would shock you. After all, Amrit is just water, a true Amritdhari constantly strives to better themselves. Look at the context in which the later Gurus lived, they fought against Islamic Mughal oppression rather than converting and becoming like them. WHERE HAS THIS SPIRIT GONE? I rarely see this TRUE Sikh spirit, fighting against oppression, be it social or otherwise.

Something you should understand about being a minority, and this even goes for places like India, where Sikhs are also minority! It is natural that people will have preconceptions about you. There are very few people in all communities (your preconception of white people comes to mind) who actually look at outsiders for the person they are. However this is what the Gurus taught - judge a person by how they live and treat others, not from the people they are surrounded by. Do you expect others not to generalise you when you yourself are doing such? Follow the true Sikh spirit and make that change, and you may even find that your Sikh values are at odds with Punjabi culture.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sikh-youth/31953-peer-pressure-western-traits-and-relationships.html

Our beloved Gurus urged us to live in the world. This makes us stronger in our values and helps us to better society where we can. We are living in a society where it is much easier to express our disconnection with religion, and therefore there is currently a LARGE secular - religious rift in all communities.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=31953

It sounds to me as if your friends are uneducated. Or are they just curious? May be offer to take them to the Gurdwara if they have questions, offer them some literature. Explain that you are still a learner, and that LEARNING is a large part of being a Sikh.

Furthermore on the concept of God - the Guru Granth Sahib has a monistic message (not monotheistic). It says God is one, and that God has hundreds of thousands of feet, yet he has none. There is nothing that isn't God, and God has no limits. If we give God limits, then he can be equal to a few hundred men, and is therefore no longer god (just a deity with limitations). Maya (illusion) makes us believe that we are separate from God, yet it is the aim of life to realise that this maya is a part of God, and things are truely connected. So God does not have to be proven according to this theory, since God, by definition exists. It is therefore a question of accepting this definition, and maya is the element which stops this process. Waheguru simran is the Guru given tool to help us remember that we are truly one with Waheguru, through this veil of maya.

From a gora - CaramelChocolate rangesingh: