Will he who testifies that there is no god but Allah enter Paradise, even if he does not believe in Muhammad (peace be upon him), or curses and insults him?

Whoever disbelieves in the Prophet Muhammad, peace and blessings be upon him, or insults him, is a disbeliever abiding eternally in the Fire, as the Prophet, peace and blessings be upon him, informed us: "By Him in Whose Hand is the soul of Muhammad, there is none among this nation, whether a Jew or a Christian, who hears of me and then dies without believing in that with which I have been sent, except that he will be among the people of the Fire." Therefore, it is necessary to believe in all of Allah's messengers. Allah Almighty said: "Indeed, those who disbelieve in Allah and His messengers and wish to separate between Allah and His messengers and say, 'We believe in some and disbelieve in others,' and wish to adopt a way in between – those are the disbelievers, truly. And We have prepared for the disbelievers a humiliating punishment." And whoever insults the Prophet, peace and blessings be upon him, or defects him, or attributes any imperfection to him, or curses him, is an insulter of him, and his ruling is execution by the consensus of scholars and imams of fatwa.