You know what else the Quran says?

"And whoever desires other than Islām as religion - never will it be accepted from him, and he, in the Hereafter, will be among the losers."

(Surah 3:85)

You know what Muhammad himself says?

"The Messenger of Allah [SAW] said: 'Whoever changes his religion, kill him.'"

(Sunan An Nasai 4059)

And again,

"The Messenger of Allah (ﷺ) said: 'I have been commanded to fight the people until they testify to La ilaha ill-allah (none has the right to be worshipped but Allah) and that I am the Messenger of Allah, and establish regular prayers and pay Zakat.'"

(Sunan Ibn Majah 71)