Let's look away from the media for a second as that's what puts people off the most in regards to this.
The biggest proof that there is a God is the Qur'an. Shocked? Let's look into it.
The Qur'an was revealed bit by bit to a man in Arabia over 1400 years ago who couldn't read or write.
In this Qur'an, it states many scientific facts which would be totally unknown in those days as there was no technology, no microscopes or any material to prove anything.
A few examples. The embryo. In the Qur'an it explains so eloquently how the embryo is formed and then the stages it goes through as it grows. How would someone even know this without the scientific resources which came out much later? Without seeing inside the human body. You can Google this and find what the Qur'an says about the embryo and there will be no doubt there when you look at how things were in those times.
The Qur'an mentions that orbit of the planets. Also something that would be unknown to humans during that time. Nor could it be proven then.
It also mentions how the sky protects us from the sun (and I bet you remember growing up always hearing about global warming).
The Arabic language in the Qur'an is so well written that God has a open challenge in the Qur'an that all people can come together and being a verse like it, it is not possible. We could not write a book, in Arabic (even if we knew the language or got the people fluent and best at the language to write it) that could have scientific facts that for example, that could be then proven 400+ years later and not change. Science is always changing and being revised but what hasn't changed? Science has proved whatever scientific facts are mentioned in the Qur'an. And those scientific facts have not changed. There's no other explanation for how the embryo grows
This same book gets over 1.8 billion people to pray 5 times a day, to fast 30 days in Ramadhan, to give in charity, to not gamble, to not drink alcohol (but don't worry, the Qur'an promises rivers of milk, honey AND alcohol in paradise. And in paradise it won't have the negative effects that it has in this world).
Could we, even if we all came together, write a book that not only had scientific facts which would be proven hundreds of years later but also make people fast, pray, give away their money, stay away from gambling and alcohol, all of these things together?
See this is why we shouldn't look at the media portrayal of Islam. Most Muslims (not saying all are good, there are some who do bad but most are good and doing the above), so most Muslims do the above and are not on the streets killing other people. This world would be a very different place if islam was a religion of violence. Heck even if there was war, no tree can be killed, nor animals, women and children should not be touched. If islam promoted hurting others then the 1.8 billion plus Muslims would be doing that along with praying 5 times a day, not having food AND water from dawn until dusk every year (and in the UK this year many place were around 1:30am to 9:30pm fasts). This is the effect of the Qur'an on people from all over the world.
It's never been altered and thousands and thousands of people have memorised it so it could also never be altered even if someone tried. God made it a easy to remember off by heart. Some kids at the age of 6 have memorised it entirely.
If the above cannot be denied then there is one answer then that is it wasn't written by any man but something much higher, an Almighty? A powerful force? That sent his first final message with Muhammad (peace be upon him) who confirmed the message of the Prophets before him who also prayed like how Muslims pray (bowing down to God and never to any human being), who said Jesus was a Messenger and not a son of God (and Jesus never claimed to be God, that was brought about by St Paul). He confirmed Moses and Noah and Abraham and all the other Prophets came with the same message which was to worship One only and not to associate any partners with Him, He has no family but He sent Prophets.
I'm sorry if this has gotten long but if we look at the science in the Qur'an which was proven years later by scientists, that is a miracle in itself. And then we would look at what else the Qur'an says and that is that there is one God and Muhammad peace be upon him is His final Messenger. And Jesus will come. Good and bad does happen in this world but if we believe in the above and do good we are promises paradise where there will be only good.
If you have a Quran I would urge you to read it and just look at the facts first. There would be no denial in the facts proven by scientists much later. If you have any questions feel free to ask. There is no compulsion in religion nor do I want to offend anyone so please take it with me smiling at you and talking with a light heart.