ISLAM is a religion that was from time immemorial and was the religion of every single prophet who were sent to this world since its creation starting from Adam, Issac, Jacob, Moses, Jesus and Mohammad (peace be upon them all). Prophet Muhammad (pbuh) was the last and final messenger and the complete form of Islam was revealed to him 1400 years ago as Allah(swt) considered the time to be ripe for humanity to grasp the complete code of Islam. Prophets before him also bought the same message i.e Islam but that was for a specific group of people and specific region but prophet
Muhammad (pbuh) was sent to the whole of humanity not just the arabs. Every ethnicity and regions have been sent a messenger by Allah(swt) to give the message of Islam but their message were corrupted after they died and their followers started to do idol worship and become athiest by deviating and concocting the message of the prophets.
But ISLAM will be there till the end of time as Allah(swt) himself promised to guard it from all form of deviation. Till the end of time people have access to the Quran , the word of Allah(swt) and prophet
Muhammad (pbuh) sunnah to take guidance from.
This is a mercy of Allah (swt) towards mankind. SO in islam there is no concept of evolution. How will you change the word of Allah(swt)? Allah(swt) gives challenge to those who disbelieve in surah Al baqarah verse 23 :
And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof and call upon your witnesses other than Allah , if you should be truthful.
many have tried and failed and disbelievers will fail in the future as well. ISLAM as revealed 1400 years ago is here to stay till the end of time. A muslim can't even think of absurd notions like "reform".