There is no comparison between these two. The history of these monuments is the early 1900's, and it had a specific
political revisionist history in mind. They represent something entirely different than statues of religious figures, such as Buddha, or Jesus, or Mary, which are devotional in nature.
Here's an excerpt about the history of these monuments, erected by the United Daughters of the Confederacy:
“The conventional view of the UDC is that they are innocent old ladies who just want to remember their Confederate ancestors,” said Jalane Schmidt, a race and religion professor at the University of Virginia. “They created an ideology which glorified the ‘Old South,’ and dressed this up in seemingly harmless cotillion balls and bake sales.
“What is harmful about them is that for generations, they vetted textbooks, which were adopted into Southern public schools. These books promoted a false Lost Cause version of history to impressionable young white students, who then grew up to enforce segregation.”
Chief among Lost Cause principles is that the Civil War was not about slavery. The Confederacy was simply defending its states’ rights and homeland from Northern aggression, according to that belief. Another idea included in the Lost Cause is that slaves were contented and happy with their condition, and slaveholders were mostly kind to them.
Members of the United Daughters of the Confederacy. Source: Alabama Department of Archives and History.
These principles permeated the South through textbooks, pamphlets and speeches written or influenced by the Daughters, according to historians. Today, Southerners often repeat these same ideas when they oppose removing monuments.
Daughters of Confederacy Put Up Statues, Indoctrinated Generations, Historians Say - BirminghamWatch
So these monuments are about a living ideal the denial of the evils of slavery in the South and the bloody civil war that was fought to end it. They symbolize
racism, not religious devotion.