**Explanation:**

Rammohan Roy, also known as Raja Ram Mohan Roy, was a prominent social reformer and intellectual in early 19th-century India. He played a vital role in promoting social, political, and educational reforms in the country. One of his objectives was to bridge the gap between different religious communities in India, particularly between Hinduism and Christianity.

**Incorporating the Moral Message of Christ in Hinduism**

Rammohan Roy believed that the high moral message of Christ, which emphasized principles such as love, compassion, and equality, could greatly benefit Hindu society. He saw Christianity as a source of moral teachings that could help reform Hinduism and bring about a more inclusive and ethical society. Rammohan Roy aimed to incorporate these moral teachings of Christ into the Hindu religious framework.

**Hostility of Missionaries**

However, Rammohan Roy's efforts to incorporate the moral message of Christ into Hinduism did not sit well with the missionaries. The missionaries were representatives of Christian religious organizations who aimed to spread Christianity and convert people to the faith. They saw Rammohan Roy's approach as a dilution of Christian teachings and a threat to their missionary work.

The missionaries believed that the unique aspects of Christianity should be preserved and that Rammohan Roy's proposal would undermine their efforts to convert Hindus to Christianity. They felt that by incorporating Christian principles into Hinduism, there would be less incentive for Hindus to convert to Christianity.

**Conflict of Interests**

As a result, the missionaries became hostile towards Rammohan Roy and his ideas. They saw him as a challenge to their religious authority and as someone who was compromising the distinctiveness of Christianity. They opposed his attempts to blend the moral message of Christ with Hinduism.

It is important to note that Rammohan Roy's ideas also faced opposition from other quarters, such as the conservative elements within Hindu society and some Indian Muslims. However, the question specifically asks about the hostility of the missionaries, which was indeed a significant aspect of the opposition he faced.

**Conclusion**

In conclusion, Rammohan Roy's desire to incorporate the high moral message of Christ into Hinduism got him the hostility of the missionaries. They saw his approach as a threat to their missionary work and the distinctiveness of Christianity. Despite facing opposition, Rammohan Roy's efforts laid the foundation for the religious and social reforms that would shape modern India.