All the forms of the God are equal
All the forms of the God are equal because the unimaginable God is one and the same existing in all these forms. When the same current is flowing in the wires of copper and aluminum, we say that both the wires are equal from the point of the same current flowing in them. This does not mean that copper and aluminum are one and the same. If you do not realize the current existing in these wires, you will find only the difference between wires and not oneness, which is the current. Unless one realizes the unimaginable God, he will be seeing only difference in the different forms. Such state is primitive stage of knowledge and such person sees Shiva and Vishnu separately.
Such a person naturally sees Shiva and Jesus also separately. When the Hindu saint sees Shiva and Vishnu equally, based on the same logic he can see Shiva, Vishnu, Jesus, Mohammad, Buddha, Mahaveera etc., equally. This is the unique greatness of Hinduism, which stands as a mini model for universal spirituality. Thus, a Hindu is expected to die as a human being realizing the Universal Spirituality in the end and therefore is expected to take Sanyasa and become a saint in the end at least. Here, Sanyasa means achievement of such knowledge of universal spirituality that alone brings peace and harmony in the world.