I am on verge of leaving Islam

Hey guys, I just joined the community. I am from India and for past few days I have started to question the truth about Islam. My whole life I myself believed that Quran is the book of Science because it perfectly aligns with the truth and discovery scientists make today. But I am starting to lose faith now and I am scared because I don't know how to lead a life without believing in anything at all. Just want to ask what do you guys believe in?? I mean is their no before or after?? If we die is it done?? Nothing at all? No spirit realm or alternate reality?? Is this life all we got?? I would really like to know your opinions on this...

Even when I started losing faith I believed that Mohammed was an Honourable man but stories about him here had made me think otherwise. I would really like to know what do you all think, was he a good man who wanted to do good for people but he made some wrong decisions or he did what he did for personal gain. I would like answers from actual ex muslims not from people who just hates Islam...