And We have not sent you except comprehensively to mankind as a bringer of good tidings and a warner. But most of the people do not know.[Quran 34: 28]
And We have revealed to you, [O Muhammad], the Book in truth, confirming that which preceded it of the Scripture and as a criterion over it.[Quran 5: 48]
And whoever desires other than Islam as religion - never will it be accepted from him, and he, in the Hereafter, will be among the losers.[Quran 3: 85]
This cannot be undone and I am sure it will be greatly appreciated.