WHY- THE CREATION OF THE TWO SIDES OF A COIN

'Sesunguhnya Kami mengutusmu dengan kebenaran, sebagai pembawa berita gembira dan pemberi amaran, dan tidak ada satu umat pun (sebelum) melainkan ADA dalam kalangan mereka seorang Rasul pemberi ingatan dan amaran' 35:24

'... dan tiap2 umat ada Nabinya yang memimpin ke jalan yang benar' 13:7

If He wants to, He COULD make everyone submit themselves to Him, which Islam itself means, submit. He could make the world at peace, without war, everyone has the soul of the holy angels. But that would mean there are NO point of creating Humans.
"Adakah kamu sangka Kami ciptakan kamu sia-sia?.." 118:115

Why are we created? Your Creator tells you:
"He Who created Death and Life, so that He may try, which of you is the best in his deed.." 67:2

Lastly, for those that open his heart to Islam, the following word is without a question a heavy and a perfect understandable word without a single grain of doubt, that he will believe:
" The ONLY way of life (ad-din; the word religion here for me, is inappropriate) acceptable in the sight of Allah is Islam('salam', or submission to Allah, the One Creator)" 3:19

Islam is the bearer of Great news, the only religion that has been guranteed pure and pristine by Allah, as He Himself has protected Al-Quran, unlike the great Kitab previously, its originality can be doubted. Religion has always been one, which is SUBMISSION to Allah. The others meanwhile, are creation of humans, a belief or thought created by mere humans. It's NEVER wrong to follow any belief, as long as we understand that humans are never perfect.