Yes. Allah has sent down miracles, revelations and messengers to give clear proofs He exists and more important, what we should do once we come to this realization.
Allah has sent prophets and messengers with many proofs throughout the ages for people to be able to clearly see with their own eyes and to be able to use their own senses the miracles and proofs pointing to the fact, Allah does in fact, exist.
Miracles of prophets and messengers of Allah have come to people through the ages. Moses, peace be upon him, showed many miracles to pharoah and to the children of Israel. Plagues, locusts, water turning to blood, his stick becoming a snake, the voice in the burning bush and the parting of the Red Sea were are clear miracles for the people of Moses time.
Again, Allah sent Jesus, the son of Mary, peace be upon him, with clear miracles for the people of his time. Speaking from the cradle while still a new born infant, creating birds from clay, curing the sick, giving sight to the blind and even bringing a dead man back to life, were all clear signs to the people to know Jesus, peace be upon him, was a messenger of Allah as was Moses before him.
Muhammad, peace be upon him, was the last and final messenger of Allah, and he was sent to all of mankind. Allah sent him with a number of miracles, not the least of which was the Quran. The predictions and prophecies of Muhammad, peace be upon him, have come true even in this century and the Quran has been used to convince even scientists of the existence of Allah.
[Please visit "Science Proves Allah": Watch video of famous scientists admit Quran is from Allah and even accept Islam]
The Quran is the best of proofs for the existence of Allah and today over one and half billion people memorize and recite from the exact text, in the exact same language it was revealed in; Arabic. More than 10 million Muslims have completely memorized the entire Quran from cover to cover, and can recite it from memory without looking at it.
No one sees or hears Allah, not even the prophet Muhammad, peace be upon him. Nor are we able to use our senses to make some kind of contact with Him. However, we are encouraged in Islam to use our senses and our common sense to recognize this entire universe could not possibly come into existence on its own. Something had to design it all and then put it into motion. This is beyond our ability to do, yet it is something we can understand.
We know from the teachings of Muhammad, peace be upon him, the proofs for the existence of God (Allah) are most obvious to us in our everyday surroundings. Anyone with understanding would quickly acknowledge His existence provided they are not so stubborn as to ignore the obvious evidences in front right in front of us.
We don't have to see an artist to recognize a painting, correct? So, if we see paintings without seeing artists painting them, in the same way, we can believe Allah created everything without having to see Him (or touch, or hear, etc.).
