According to Pew Research Group, it’s estimated that about 93% of the world’s population believes in God in some way, shape or form, with the majority of the remaining 7% (atheists and agnostics) living in China and Russia. Here’s a breakdown by % of world population:
Christians: 31.5
Muslims: 23.2
Unaffiliated: 16.3 (also includes atheists & agnostics)
Hindus: 15.0
Buddhists: 7.1
Folk Religions: 5.9 (Includes African Traditional, Chinese, Native American & Australian Aboriginal)
Other: .8
Jews: .2
Across these religions are agreements and disagreements as to the nature of God. So our investigation should be concerned not only with God’s existence, but also His nature or characteristics – that way we can more fully explore the truth claims of the world religions.