FALSE - This theory is totally abandoned.
This theory was forwarded by American Anthropologist Elwyn Simons in 1960', when he discovered a part of the upper jaw which coincides with the already found part of the upper jaw in 1932 in Siwalik hills (ranging from Sikkim to Northern Pakistan). But his student David Pilbeam has discovered a complete Ramapithecus jaw in 1976, found that the distinctive V shape and thus differed markedly from the parabolic shape of the jaws of members of the human lineage. He soon repudiated his belief in Ramapithecus as a human ancestor, and the theory was largely abandoned by the early 1980s.
Moreover, a question regarding the molecular chemistry concluded that the albumins coincide with that of various animal species. This was brought forward by American Biochemist Allan Wilson and American Anthropologist Vincent Sarich in 1960'.
Later Ramapithecus jaw was resembled with Sivapithecus which also was found in Siwalik hills, which is the ancestor of Orangutan🦧.
Hence, Ramapithecus or the Sivapithecus were not the ancestors of the entire Human race.
The Bible says that "we are made in the Image of God in their moral, spiritual, and intellectual nature" (Genesis 1:27).
Source: Britannica.
