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You don't. This unlock is added by the Afterbirth expansion.
The huge "Antibirth"-mod only working on Rebirth does give him the Holy Mantle, though it may also make some changes you don't like, such as vanilla Isaac-style Devil item costs, meaning you can't "cheat" the devil by buying a 2-heart items while only having one heart container and a bunch of soul hearts.
The Antirbirth-mod is what would later become the Repentance DLC:
https://antibirth.com/
There is no unlock for holy mantle on the Lost in Rebirth