But you aren't explaining why you believe. There IS a reason, tell me.
For example, many people believe in God. Why? Various reasons. Maybe they were brought up being told from day one that God exists. Or maybe one day they were perplexed when they asked themselves "where did all this come from?" Unable to supply a satisfactory explanation, they created a god in their own mind to deal with internal struggle. Another reason is that human, by nature, want to feel like they matter and they serve for some purpose other than themselves. For some people, this is being a devoted teacher. Some like working with sick children everyday. For a lot of people, it's being a part of God's "plan."
That's a brief explanation of why people believe in a god. Why do you believe free-will exists? Answers like "I just know" or "I can tell" are just restatements of the word "belief." Where is your logical path of reasoning?