(In the Name of Allah, Most Gracious, Most Merciful, all praise and thanks are due to Allah, and peace and blessings be upon His Messenger)

Who will enter paradise? And what will it take to enter paradise- where there is immortality and everything to be needed beyond ones wildest desires. In the Quran it is stated that:

‘And they say, ‘None shall enter Paradise unless he be a Jew or a Christian.’ These are their wishful beliefs. Say, ‘Produce your evidence if what you say is true!’
Nay, whosoever surrenders his whole being unto God, and is a doer of good, shall have his reward from his Lord; on them shall be no fear, neither shall they sorrow.’
(al-Baqarah 2: 111-12)

So, we need not be Jew or Christian as they said, but if one surrenders himself whole heartedly to God and does only good and refrains from evil he shall have his reward with his Lord in paradise and live without sorrow in Paradise.Quran-Lets Dedicate Verses.

It is also stated that Good and evil can never be equal in the Quran:

‘Good and evil can never be equal. Repel (evil) with that which is better, and see how, then, someone between whom and you was enmity shall become a true friend. Yet none is given such goodness except those who are patient; none is given this but the most fortunate.’
(al-Fussilat 41: 34-5)