How will Allah Almighty Judge the non-Muslims?

How will Allah Almighty Judge the non-Muslims? Should a person be a Muslim first to be accepted in Paradise by Allah Almighty?

As a Muslim who believes in Allah Almighty and all of His Revelations, I must believe with all my heart and mind that the Noble Quran is the Seal of all the Revelations that came from Allah Almighty, and it must be followed. Allah Almighty clearly said:

"The Religion before God is Islam (submission to His Will): Nor did the People of the Book dissent therefrom except through envy of each other, after knowledge had come to them. But if any deny the Signs of God, God is swift in calling to account. (The Noble Quran, 3:19)"

But the religion of Islam is not just limited to the Noble Quran's Revelations, especially to those who never heard of Islam, or Islam was unfortunately misrepresented to them. Islam started from Adam and ended with Muhammad peace be upon them. Islam was perfected or finished with the Revelations of the Noble Quran: "...This day have I perfected your religion for you, completed My favour upon you, and have chosen for you Islam as your religion....(The Nobel Quran, 5:3)"

Furthermore, Allah Almighty Said that He Created different Laws and Creeds to mankind:

Noble Verse(s) 5:48

Yusuf Ali:

[005:048] To thee We sent the Scripture in truth, confirming the scripture that came before it, and guarding it in safety: so judge between them by what God hath revealed, and follow not their vain desires, diverging from the Truth that hath come to thee. To each among you have we prescribed a law and an open way. If God had so willed, He would have made you a single people, but (His plan is) to test you in what He hath given you: so strive as in a race in all virtues. The goal of you all is to God; it is He that will show you the truth of the matters in which ye dispute;

Arabic (Read from right to left. Also, all png image files: [1] [2]):

5:48 وانزلنا اليك الكتاب بالحق مصدقا لما بين يديه من الكتاب ومهيمنا عليه فاحكم بينهم بما انزل الله ولاتتبع اهواءهم عما جاءك من الحق لكل جعلنا منكم شرعة ومنهاجا ولو شاء الله لجعلكم امة واحدة ولكن ليبلوكم فيما اتاكم فاستبقوا الخيرات الى الله مرجعكم جميعا فينبئكم بما كنتم فيه تختلفون

So the Believers today are certainly not just limited to the ones who believe in the Glorious Quran alone, as long as:

1- They are not hostile enemies to Islam.

2- They are not polytheists, and they don't associate partners with Allah Almighty.

3- They are not wicked and evil. Also, not hypocrites and liars and other evil types.