Salam alaykum dear brother.
Their claims are very silly. We muslims do not worship Prophet Mohammad (salla Allah alayhi wa sallam).
Please show me just only one ayah from Glorious Quran which say to worship Rasulallah (salla Allah alayhi wa sallam).
When we say: Al-salamu ´alayka ayyuha al-Nabiyu wa rahmatu Allah wa baarakatuhu. This is not worship, we only salute him with Peace and we ask Allah's mercy and blessings on him.
Do you know what prayer is? Did you hear any muslim praying: Oh Mohammad Messenger of God forgive me!? "Astaghfirullah!" I think you never heard this.
