Salam!
Read this, it's helpful.
Haven't You Ever Thought?
The truth has revealed. Everything is clear.
Oh Non-believers! What are you waiting for? What are the things that you still want to embrace Islam? Are you waiting for a sound from heaven to enlighten you with the truth? You should be aware that this will not occur as it's your decision now. God gave us brains to think and realize what is happening around. Be open-minded and get to know by yourself. Islam is the truth.
Haven't you ever thought of why the Holy Quran has never changed since the first day it was revealed? It's because God promised that it would never change. Haven't you ever thought of why Islam is the fastest spreading religion? It's because that Islam is the truth and many people are conscious of it.
Haven't you ever thought of the scientific theories that are in the Holy Quran, which were written from about 1400 years ago, and how studies proved them recently? Haven't you ever thought of why Islam is the only religion that is constantly vilified yet keeps growing? Haven't you ever thought of why Islam is the only religion that believes in the previous religions and their Holy Scriptures but others don't?
Haven't you ever thought of why Islam is perfected for all time and people, while other religions are only sent for a particular group and time? Haven't you ever thought of the signs of the day of judgement that are declared in Islam and how most of them have happened? Haven't you ever thought of why many Christian preachers are turning to Islam? Haven't you ever thought of why you are not a Muslim till this day?
Walsalam!