Did rama ever said he is going to found Hinduism?
Did krishna ever said he is going to Found Hinduism?
Did buddha ever said he is Going to Found Buddism?
Did Guru nanak Ever said he is going to found Sikhism?
NO, What common between them is their message. they all said similar things, but used a diffrent method to explain them. Another diffrence between them was Time and culture in which they born.
God created us, God created Krishna, Budda, Guru Nanak to spread his message and We Human created religion.