One Religion
Humanity was once a single community, but then they differed. So, Allah sent prophets as bearers of good news and warners, and revealed to them the Scripture in truth to judge between people in their disputes. Yet none disputed it except those who had received it, after clear proofs had come to them, out of jealousy. Then Allah, by His grace, guided the believers to the truth regarding those disputes.
2:213Mankind were one community, and Allah sent (unto them) prophets as bearers of good tidings and as warners, and revealed therewith the Scripture with the truth that it might judge between mankind concerning that wherein they differed. And only those unto whom (the Scripture) was given differed concerning it, after clear proofs had come unto them, through hatred one of another. And Allah by His Will guided those who believe unto the truth of that concerning which they differed. Allah guideth whom He will unto a straight path.
This is the way of Allah, a mark upon His creation. Who is better than Allah in setting a way? And to Him alone we are devoted.
2:138(We take our) colour from Allah, and who is better than Allah at colouring. We are His worshippers.
So set your face toward the true faith, Allah’s natural way upon which He created humanity. There is no change in Allah’s creation. This is the upright religion, but most people do not know.
30:30So set thy purpose (O Muhammad) for religion as a man by nature upright - the nature (framed) of Allah, in which He hath created man. There is no altering (the laws of) Allah's creation. That is the right religion, but most men know not -
Turn to Him in devotion.
30:31Turning unto Him (only); and be careful of your duty unto Him and establish worship, and be not of those who ascribe partners (unto Him);
Do not be like those who divided and differed after receiving clear guidance.
3:105And be ye not as those who separated and disputed after the clear proofs had come unto them. For such there is an awful doom,
Had Allah willed, He could have made you one community, but He leaves some to stray and guides others. You will be questioned about what you used to do.
16:93Had Allah willed He could have made you (all) one nation, but He sendeth whom He will astray and guideth whom He will, and ye will indeed be asked of what ye used to do.
Had Allah willed, He could have made them one community, but He admits into His mercy whomever He wills.
42:8Had Allah willed, He could have made them one community, but Allah bringeth whom He will into His mercy. And the wrong-doers have no friend nor helper.