The reason to believe

May Allah (SWT) guide us through life. 

"why is it that you believe in something that doesn't exist"  (Esterfullah) this is a question we all experience, Muslim, Christian or Jew. To fully being able to answer this Question you should educate your self about your religion. 
In the Quran, it states "there will be those who say they believe, yet go home and act like nonbelievers" 
Does who act like this will not be able to answer the question, sins they don't bother knowing.  Allah (SWT) sees and knows everything.
religion is like modern-day rules, you do right and you get rewarded, yet the outcome of religion has a greater purpose and meaning. You may not think that you have seen the power of Allah (SWT) yet when you go through bad times you pray and ask for better days and when those days come around you should know that Allah (SWT) granted you granted you that.  Yet if you still don't believe, he will make you start over, for your own sake. Allah (SWT) is forgiving and loving.
The reason to believe will only benefit your self, when judgment day comes not even a mother will care for her newborn child. PRAY, READ THE QURAN, BE RESPECTFUL TO YOUR PARENTS, NABORS, BROTHERS, AND SISTERS ETX. and Allah (SWT) may Inshallah grand you the best of the best.

Fear only Allah (SWT) he will give and take, this may not sound fair to some people. Yet we live in a society that pressure os to work, just so we can buy what they make and create. If not, we will end up on the street. My Brothers and Sisters our "money" and deeds will bring os closer til the key of Jennah (haven) something no man can create.