IF Allah said to use that we belive in all the books and all the prophets and the three realgion. If Allah said the Quran and Islam is the only Truth. Then why did Allah sent the other books and prophets and . realgion
Hello brother. I am glad that you are asking questions about your religion. This is good. I am no expert myself. I used to be a Christian not too long ago. I want to ask you, have you ever read the Bible? The old testament and the new testament? And then the Quran?
What you will find is that the same religion that our Prophet, peace be upon him, brought to us is the exact same religion that the Prophets (peace be upon them all, brought before him.
That message was to worship ONE god and to put no others before Him. If you read the Bible you will find this message throughout but some parts of it are at odds with this teaching because it was changed at later times. Even prominent Christian scholars agree with this and you will see that many Christians do not follow the teachings in the Bible. Men have abrogated even the teachings of Jesus (peace be upon him) in the Bible and follow their own teachings. This is why you will even find some Christian sects who do not celebrate Christmas, Easter, some who do not believe in later teachings like the trinity or even his divinity and some that do. Some Christian sects in which the women cover their hair and others that do not.
Islam is complete submission to the Creator of the worlds. Islam was the religion of Adam (peace be upon him) even before the Children of Israel came into existence. It was only later in human history that polytheistic faiths came about and people began to worship idols. You will see this from studying anthropology how some parts of the world were on a message of One God while others worshiped many gods and idols.
If you read the Bible, you will see that there is still some truth still in it. That is why we are to respect this and the people of the book. Some of the laws of Allah are still there in those books. Unfortunately, the message was altered by man and not quite in its original form, the way that it was intended. And now, not even the originals exist.
As Muslims we believe that the Prophet Muhammad (peace be upon him) was the final messenger in a series of messengers that were brought throughout mankind to remind them of the message to worship one God. Islam is the same truth that's been there before and Islam is the final truth and guidance for us after the other messages were changed over time away from pure monotheism.
When you read the Quran you will see that it is filled with parables and stories about other nations and people that have come before us and the mistakes that they made. We are meant to learn from them so that we can do right and worship Allah in the correct way in shaa Allah. Islam is there as a guidance for mankind until the Day of Judgement. And Allah tells us in the Quran:
"...
This day I have perfected for you your religion and completed My favor upon you and have approved for you Islam as religion." [5:3]