The Jannah-Bound

Muslims like to say that there will be so many millions (or billions) of Muslims by such-and-such a year.

What does the Quran say about the Jannah-bound?

S 2:62 Those who have believed and those who were Jewish and the Nasara and the Sabians--those who have believed in Allah and the last day and have done a righteous deed, theirs is their wage with their lord and there is no fear upon them nor do they grieve.

S 5:69 Those who have believed and those who were Jewish and the Sabians and the Nasara, he who has believed in Allah and the last day and has done a righteous deed, there is no fear upon them and they do not grieve.

Christians, Jews and even the heathen Sabians can get into the Jannah. So why bother to convert to Islam?

Regarding a grammatical error in S 5:69, see: The Qur'an: Grammatical Errors

It was narrated from ‘Awf bin Malik that the Messenger of Allah(ﷺ) said:

“The Jews split into seventy-one sects, one of which will be in Paradise and seventy in Hell. The Christians split into seventy-two sects, seventy-one of which will be in Hell and one in Paradise. I swear by the One Whose Hand is the soul of Muhammad, my nation will split into seventy-three sects, one of which will be in Paradise and seventy-two in Hell.” It was said: “O Messenger of Allah, who are they?” He said: “The main body.”

https://sunnah.com/ibnmajah/36/67

According to the hadith above, the Jews have a 1/71 chance of getting into the Jannah, the Christians a 1/72 and the Muslims a 1/73 chance. The Jews and Christians have a greater chance of getting in, and all without converting to Islam; the Muslims, however, have just one chance in 73 of getting into it, depending upon their being in the right sect. It would seem that someone asked just which exactly the winning sect of Islam was, and that the founder of Islam tried to fob him off with a non-answer, which the translator renders "The main body", the word being "Al-jama'ah", 'The group'.