Renukaji,
I don't see anything wrong in different interpretations of the Hindu culture and traditions and the influence by other religions. And supporters will always try to glorify their religion and faith, and find common grounds in the wide diversity.
Absolutely agree with your view that Hinduism is a aggregate of various schools of thoughts and that's the beauty of our religion. It allowed dissent, and encouraged various schools, and despite huge differences and fights among them, most of them coexisted till invasions uprooted some of them.
That does not mean, there "was" no unity in Hinduism.
If this were not to be the case, all Hindu kingdoms would not have united under the great srivijayan (Vijayanagar) kingdom and stopped the Mughal invasion to south.
The biggest failure is that we did not reform our religion and abolish the caste system either during the British regime or right after independence. Instead we have messed up completely leading to continued dissension and incessant fights.
Hence Hinduism today is divided unlike the monolith of other religions.
JK.