Why is Brahma not the same as Allah???

Because 'Hinduism' (religions (pl.) of Al Hind) is not the same as Islam. Simple enough???

Bismillah Ar Rahman Ar Raheem

'The worshippers of false gods say: "If Allah had so willed, we should not have worshipped aught but Him - neither we nor our fathers,- nor should we have prescribed prohibitions other than His." So did those who went before them. But what is the mission of apostles but to preach the Clear Message?'

Sura 16:35 An Nahl - The Bee.