No, I don't believe God exists.
If God wants every humans on the earth to believe in God, God got to show up one day in front of EVERYONE at the same time and stick around for a while so we can perform series of tests on God. Blood work, genetics, physical exams...all sorts of tests while we record God's existence with all the technology we've got.
Why isn't God doing this? Is there "something" preventing God from doing this? Well, I was informed that God is perfect and there's nothing God can not do, so that "something" should not be a problem.