\documentclass[]{article}
\usepackage{polyglossia}
\setmainlanguage[variant=french, autospacing=false, autospaceguillemets=true, frenchfootnote=true]{french}
\setotherlanguage[variant=ancient]{greek}
\newfontfamily\greekfont{IFAO-Grec Unicode}
\usepackage[series={A},noend,noeledsec,noledgroup]{reledmac}
\Xarrangement[]{paragraph}
\begin{document}
\showoutput
\begin{greek}
\beginnumbering
\pstart \edtext{Ὁ}{\lemma{ὁ}\Afootnote{om. S J}}\footnoteA{blabla} Θεὸς γὰρ ἀψευδής ἐστιν ὁ Υἱὸς τοῦ Θεοῦ. Εἰ δὲ \edtext{ἀναισχυντεῖς}{\lemma{ἀναισχυντεῖς}\Afootnote{ἀπαισχυντῆς Pa}}, πάλιν προφηστεύσουσ…