What you have gone through is certainly wrong. But let's step back and think about it. You have tried finding the house in 'Mumbai' and in ust 1 locality. Mumbai has a history(riots) and obviously people (like you) are sceptic. You were lucky to have a Sikh friend not everyone is but rest assured, if Muslims have changed, Hindus in Mumbai would change. We are all humans( and some may not believe but son of same God). Pointing the finger on all of Hindu community is not good. I am certain it's not the case in major part of India. If it took you 13 years, it might take some more time for Hindus.