Prophets in Islam
Muslims believe in all of the true prophets that preceded Muhammad, from Adam to Jesus (Peace be upon them all). Muslims believe they brought the same message of voluntarily surrendering to God's will (islam, in a generic sense) to different peoples at different times. Muslims also believe they were "muslims" (again, in a generic sense) since they followed God's true guidance and surrendered their will to Him.
Who is Muhammad?
Who Muslims Worship
Muslims neither worship Muhammad nor pray through him. Muslims solely worship the Unseen and Omniscient Creator, Allah.