The combination of Faith, Hope, Mercy, and Religion appears in classical cemetery architecture and monument design, where they are personified as allegorical figures or “guardians.” The guardians are frequently accompanied by an Archangel.
Faith: Usually depicted holding a sturdy Latin cross or looking upward toward the heavens.
Hope: Almost universally anchored by a large ship’s anchor or holding a fresh olive branch.
Mercy: Often shown with arms crossed gently over the chest, or reaching downward to extend comfort.
Religion: Frequently depicted holding scripture, a stone tablet, or an open book of law.
They are frequently accompanied by an Archangel:
Michael: Courage, defense, and the fight against evil. Typically, depicted with a sword.
Gabriel: Divine news, wisdom, and revelation. Typically depicted with a trumpet.
Raphael: Physical and spiritual healing, and safe travel. Symbolized by a staff or fish.
Uriel: Light, truth, and inner wisdom. Symbolized by an open scroll, book, or flame.
Lucifer: Light, Desire, Free-Will and Justice/Light Bringer or Light Bearer (Fallen.) His name translates directly to “Light Bringer”. His pre-fall symbolism includes pristine white light, torches, and radiant cosmic fire, representing divine illumination, wisdom, and clarity.

Archangel Michael is typically depicted with a sword symbolizing courage, defense and the fight against evil.

If you see an angel holding a trumpet, generally that’s the Archangel Gabriel. The trumpet stands for the call to resurrection.

An angel holding a book, is generally the Archangel Uriel representing supreme wisdom, inner illumination, and truth.

The Haserot Angel—properly named “The Angel of Death Victorious”—is a famous life-size bronze sculpture located in Lake View Cemetery in Cleveland, Ohio.
An angel with a torch may represent the fallen Archangel Lucifer.

An angel with a staff generally represents the Archangel Raphael symbolizing physical and spiritual healing, and safe travel.

Mackay Mausoleum
The Mackay Mausoleum in New York’s Green-Wood Cemetery was built by Muldoon & Co. of Louisville, Kentucky in 1898.
Each corner of the Mackay Mausoleum contains life-sized bronze sculptures representing sorrow, faith, death, and life. The mausoleum is a miniature church auditorium with a capacity of 50. It was fitted with a heating system and electric lights that turn on only when the large bronze doors are opened.

Lithgow-Smyser Monument, Cave Hill Cemetery, Louisville, Kentucky
Also built by built by Muldoon & Co. the Lithgow-Smyser Monument represents Faith, Hope, Mercy, and Religion accompanied by Archangel Gabriel.
Per the Smithsonian: A multitiered monument featuring Angel Gabriel on top, sitting with her proper raised to her forehead and her proper left arm holding a horn in her lap. Four figures representing Faith, Hope, Mercy and Religion are beneath her at four corners, facing out.
Sources:
The Smithsonian Institute, Lithgow Monument