Title: Ancient Egyptian religion
Content:  writings and depictions, and beginning in the late New Kingdom his religious importance declined drastically. The king was also associated with many specific deities. He was identified directly with Horus, who represented kingship itself, and he was seen as the son of Ra, who ruled and regulated nature as the pharaoh ruled and regulated society. By the New Kingdom he was also associated with Amun, the supreme force in the cosmos. Upon his death, the king became fully deified. In this state, he was directly identified with Ra, and was also associated with Osiris, god of death and rebirth and the mythological father of Horus. Many mortuary temples were dedicated to the worship of deceased pharaohs as gods.
Title: Ancient Egyptian religion
Content:  The Middle Kingdom crumbled in the Second Intermediate Period (c. 1650–1550 BC), but the country was again reunited by Theban rulers, who became the first pharaohs of the New Kingdom. Under the new regime, Amun became the supreme state god. He was syncretized with Ra, the long-established patron of kingship and his temple at Karnak in Thebes became Egypt's most important religious center. Amun's elevation was partly due to the great importance of Thebes, but it was also due to the increasingly professional priesthood. Their sophisticated theological discussion produced detailed descriptions of Amun's universal power. Increased contact with outside peoples in this period led to the adoption of many Near Eastern deities into the pantheon. At the same time, the subjugated Nubians absorbed Egyptian religious beliefs, and in particular, 
Title: Ancient Egypt
Content:  of the Nile in Nubia, cementing loyalties and opening access to critical imports such as bronze and wood. The New Kingdom pharaohs began a large-scale building campaign to promote the god Amun, whose growing cult was based in Karnak. They also constructed monuments to glorify their own achievements, both real and imagined. The Karnak temple is the largest Egyptian temple ever built. Around 1350BC, the stability of the New Kingdom was threatened when Amenhotep IV ascended the throne and instituted a series of radical and chaotic reforms. Changing his name to Akhenaten, he touted the previously obscure sun deity Aten as the supreme deity, suppressed the worship of most other deities, and moved the capital to the 
Title: Egyptian temple
Content:   With greater power and wealth during the New Kingdom (c. 1550–1070 BC), Egypt devoted still more resources to its temples, which grew larger and more elaborate. Higher-ranking priestly roles became permanent rather than rotating positions, and they controlled a large portion of Egypt's wealth. Anthony Spalinger suggests that, as the influence of temples expanded, religious celebrations that had once been fully public were absorbed into the temples' increasingly important festival rituals. The most important god of the time was Amun, whose main cult center, the Precinct of Amun-Re at Karnak in Thebes, eventually became the largest of all temples, and whose high priests may have wielded considerable political influence. Many temples were now built entirely of stone, and their general plan became 
Title: Egypt
Content:  The New Kingdom c. 1550–1070 BCE began with the Eighteenth Dynasty, marking the rise of Egypt as an international power that expanded during its greatest extension to an empire as far south as Tombos in Nubia, and included parts of the Levant in the east. This period is noted for some of the most well known Pharaohs, including Hatshepsut, Thutmose III, Akhenaten and his wife Nefertiti, Tutankhamun and Ramesses II. The first historically attested expression of monotheism came during this period as Atenism. Frequent contacts with other nations brought new ideas to the New Kingdom. The country was later invaded and conquered by Libyans, Nubians and Assyrians, but native Egyptians eventually drove them out and regained control of their country.
Title: Ancient Egyptian deities
Content:  to exist. New Kingdom writings do not question the just nature of the gods as strongly as those of the Middle Kingdom. They emphasize humans' direct, personal relationships with deities and the gods' power to intervene in human events. People in this era put faith in specific gods who they hoped would help and protect them through their lives. As a result, upholding the ideals of maat grew less important than gaining the gods' favor as a way to guarantee a good life. Even the pharaohs were regarded as dependent on divine aid, and after the New Kingdom came to an end, government was increasingly influenced by oracles communicating the gods' will.
Title: Ancient Egyptian religion
Content:  given epithets that seem to indicate that they were greater than any other god, suggesting some kind of unity beyond the multitude of natural forces. This is particularly true of a few gods who, at various points, rose to supreme importance in Egyptian religion. These included the royal patron Horus, the sun god Ra, and the mother goddess Isis. During the New Kingdom (c. 1550–1070 BC) Amun held this position. The theology of the period described in particular detail Amun's presence in and rule over all things, so that he, more than any other deity, embodied the all-encompassing power of the divine.
Title: History of Egypt
Content:  The New Kingdom (c. 1550–1070 BC) began with the Eighteenth Dynasty, marking the rise of Egypt as an international power that expanded during its greatest extension to an empire as far south as Tombos in Nubia, and included parts of the Levant in the east. This period is noted for some of the most well known Pharaohs, including Hatshepsut, Thutmose III, Akhenaten and his wife Nefertiti, Tutankhamun and Ramesses II. The first historically attested expression of monotheism came during this period as Atenism, although some consider Atenism to be a form of monolatry rather than of monotheism. Frequent contacts with other nations brought new ideas to the New Kingdom. The country was later invaded and conquered by Libyans, Nubians and Assyrians, but native Egyptians eventually drove them out and regained control of their country.
Title: List of pharaohs
Content:  The New Kingdom (1550–1077 BC) is the period covering the Eighteenth, Nineteenth, and Twentieth dynasty of Egypt, from the 16th to the 11th century BC, between the Second Intermediate Period, and the Third Intermediate Period. Through military dominance abroad, the New Kingdom saw Egypt's greatest territorial extent. It expanded far into Nubia in the south, and held wide territories in the Near East. Egyptian armies fought with Hittite armies for control of modern-day Syria. Three of the best known pharaohs of the New Kingdom are Akhenaten, also known as Amenhotep IV, whose exclusive worship of the Aten is often interpreted as the first instance of monotheism, Tutankhamun known for the discovery of his nearly intact tomb, and Ramesses II who attempted to recover the territories in modern Israel/Palestine, Lebanon and Syria that had been held in the Eighteenth Dynasty. His reconquest led to the Battle of Qadesh, where he led the Egyptian armies against the army of the Hittite king Muwatalli II.
Title: Ancient Egyptian deities
Content:  was usually identified with the creator deity. In different periods of Egyptian history, different gods were most frequently said to hold this exalted position. Horus was the most important god in the Early Dynastic Period, Ra rose to preeminence in the Old Kingdom, Amun was supreme in the New, and in the Ptolemaic and Roman periods, Isis was the divine queen and creator goddess. Newly prominent gods tended to adopt characteristics from their predecessors. Isis absorbed the traits of many other goddesses during her rise, and when Amun became the ruler of the pantheon, he was conjoined with Ra to become a solar deity.

Question: what was the most important new religious figure of the new kingdom of ancient egypt?
Answer: Aten.