Believers are judged in an easy way, unbelievers in a hard way

The trial of the unbelievers, who did not follow Allah's path and pursued either their own desires and cravings or the twisted values or beliefs of their societies, will be very hard indeed. On that Day, there will be no mercy or compassion for them, and no power will be able to end their suffering. The main reason for this is that they did not respect Allah's boundaries, even though they were sent reminders, and that they would not have done so even if they were sent back to Earth. This truth is revealed in the following verses:

If only you could see when they are standing before the Fire and saying: "Oh! If only we could be sent back again, we would not deny the Signs of our Lord and we would be among the believers." No, it is simply that what they were concealing before has been shown to them; and if they were sent back they would merely return to what they were forbidden to do. Truly they are liars. (Surat al-An‘am, 27-28)

While they are accounting for their deeds, the blazing Hell is awaiting them. They will be sent to Hell in return for what they did while alive, for:

When the Pages are opened up, when the Heaven is peeled away, when the Fire is set ablaze, when the Garden is brought up close: then each self will know what it has done. (Surat at-Takwir, 10-14)

Other verses reveal that the believers will have an easy trial:

O Man! You are toiling laboriously toward your Lord, but meet Him you will! As for him who is given his Book in his right hand, he will be given an easy reckoning and return to his family joyfully. (Surat al-Inshiqaq, 6-9)

The believers who have lived their lives according to the will of our Lord, Who created and guided them onto the right path, will have their sins forgiven by Allah the Most Merciful, Who has revealed that He will forgive sins and turn them into goodness for those who believe and do good. On that Day, our Lord will address the believers, who will already have received what was promised:

"O self at rest and at peace, return to your Lord, well-pleasing and well-pleased! Enter among My servants! Enter My Garden." (Surat al-Fajr, 27-30)

In this way, they will be saved from the eternal Hellfire by His grace and favor and enter Paradise full of endless reward. Their reply to "enter Paradise" is revealed in the Qur'an:

They will say: "Praise be to Allah, Who has fulfilled His promise to us and made us the inheritors of this land, letting us settle in the Garden wherever we want. How excellent is the wage of those who work!" (Surat az-Zumar, 74)