Guru Granth Sahib Ji does not say to keep hair. In fact, God doesn't care if you have hair. Again, it was Guru Gobind Singh Ji who made this "rule".
When I said that you have to understand the religion to know the significance of keeping unshorn hair, I MEANT it. This is not beating around the bush etc. I know people who understand the religion and know why hair is important and I know people who don't understand Sikhism and say hair are not important. One who understands will always be in "favour" of keeping hair and one who doesnt, will not be.
Is that clear?
Bhagat