[BlatherNaut]

If Catholics and muslims worship the same God, why did the Blessed Mother only intercede on the Catholic’s behalf at the Battle of Lepanto?

Because they are heretics. Muslims worship the true God in an imperfect and twisted way.

[ebb tide]

I respectfully disagree.

[22] Who is a liar, but he who denieth that Jesus is the Christ? This is Antichrist, who denieth the Father, and the Son. [23] Whosoever denieth the Son, the same hath not the Father. He that confesseth the Son, hath the Father also. John Chapter 2

According to St. John, Muhammad was an anitChrist.

[ebb tide]

Saint Peter Mavimenus (died A.D. 743): "Whoever does not embrace the Catholic Christian religion will be damned, as was your false prophet Mohammed." (Roman Martyrology, February 21st) [Upon this profession of the faith, the infidel murdered him.]

Saint George of San Saba (died A.D. 852): "Mohammed was a disciple of the devil, and his followers are in a state of perdition." (In "Victories of the Martyrs" by Saint Alphonsus)

Blessed Nicholas Talvilich (died 1391): "You Mohammedans are in a state of everlasting damnation. Your Koran is not God's law nor is it revealed by Him. Far from being a good thing, your law is utterly evil. It is founded neither in the Old Testament nor in the New. In it are lies, foolish things, buffooneries, contradictions, and much that leads not to virtue and goodness but to evil and to all manner of vice."

[ebb tide]

Because they are heretics. Muslims worship the true God in an imperfect and twisted way.

From your above definition, do you also consider the Jews to be heretics?

[piusv]

According to Catholic teaching, Muslims are not heretics, they are infidels. Heretics are of the baptized.