This questions has been asked so many times in the universities by the students that how do we know God exists? The question seems to be tricky because no one within their power of vision is able to see the God almighty, but the answer to this difficult question is quite simple.
According to the creed, Muslims believe that God is supernatural, He is invisible but he is still visible through his creation, look at the child and the love of his mother in his eyes, looking at the stars and moon, looking at the chirping birds and the microbiological cells, we can easily understand that all these living beings with cells and enzymes cannot be created by itself. There is an entity who has created them for some purpose on this planet. His name is Allah or God.
When you ask an Atheist, he says that God does not exist. The denial is based on his personal judgment and abilities to understand the existence of God. So many people in the world adopt the religions of their forefathers, God says every human being is born Muslim until they choose another way or religion for living their life. Intellect is that way is an enemy of faith, it leads to Kufr )denying there is a God) and Shirk which is the most horrible sin in Islam. Some non Muslims also believe that Islam is a merciless religion because they are being presented the wrong picture of Islam.
To satisfy the concept of the existence of God to humans and atheist, science has explored Quran and compared it to the evidence found in scientific research. Quran s a 1400 years old book which pointed out some revelations that science never discovered until the 20th century. The scientist was amazed to read Quran and found out that this book is written by some high intelligence source that is not human. The theory of probability also proves that God exists. The holy books of Muslims Quran s a book of signs of God’s existence. The 6000 ayat contains scripture that reveals the secrets that science can prove right now. Using the scientific knowledge, it can be easily proved the Quran is the word of God. Quran is enough to prove to an atheist that God exists.
Quran contains a lot of scientific knowledge also that measures what has been discovered by the science recently. An in-depth study of science makes a man believe in God because the scientists accepted Islam after reading Quran in the past. God says in the Quran in Surah Fussilat:
“Soon We will show them our signs in the (farthest) regions (of the earth), and in their own souls until it becomes manifest to them that this is the Truth. Is it not enough that thy Lord doth witness all things?” [Al-Quran 41:53]
So the question is not that if the God exist? It is that if we exist or not? Our lives are in the hands of God and he will call us back towards him at the appointed time.