For my part I believe in God because he speaks to me regularly and I'm the last person you'd expect that to happen to. I was minding my own business when I started hearing from God. Everyone I knew at the time was totally shocked and it took me over two years to accept what God was telling me (i.e. that the Bible is for real and I would do well to listen to what he's saying through it to me). I read Nietzsche and Russell in college and enjoyed them. I didn't really like Christianity as a religion much but I was nice to Christians I met and didn't really argue with them much. I didn't believe in anything but was respectful to everyone in other words.
My life now is defined by me trying to connect with God and make the most of my time here. I'm not trying to earn anything but I'm working because my God works all the time on my behalf. If God is my father then doing what he does is only the right thing to do if I'm actually his son. I split my time between serving adults (pastoring type stuff), children (Sunday school stuff), and the poor (I run a temporary food pantry). I also run a business to support my family, help my community, and build wealth. I keep busy and wouldn't change anything.
For me not believing in God is pretty hard even though I've seen some pretty bad things happen to people in my community that we prayed to turn around for over two years in one case. The only thing to do in the face of massive disappointment is to continue on. I've seen amazing responses to prayer and some big unanswered prayers too. Jesus prayer before he was arrested was unanswered as well. I take some comfort in that.
Life is pretty complicated and there are no easy answers especially when it comes to God and a life of faith. For me the stakes of life were raised considerably when I started following Jesus. It's not easy but it's not me to figure it all out either. The only faith I argue for is a living faith with a deep connection to a living God. I'd encourage to learn about that faith--not the faith that people say is found in books. No one in the Bible lived that way why should you or anyone else?