My French is horrible, so here is what I can decipher:
Le cinq janvier mil sept cent quatre vingt dix huit . . . baptisme Charles ne la nuit precedent[,] du legitime marriage de Charles Denis de de Marie Pelagie Guenet . . .
Roughly (by me) translated, it says:
On January 5, 1798, is the baptism of Charles, who was born the night before [4 Jan 1798] of the legitimate marriage of Charles Denis and Marie Pelagie Guenet . . . .It then lists (I think) either the witnesses or the God parents. There looks to be a reference to an "Alexandre" and also to "Marie Dejadon." The Marie Dejadon may refer to Marie Guenet's mother.