This people honoureth me with their lips
The first question is, of course, whether or not you believe existence of God. It is said that about 70% of Americans believe in God.
However, according to an article of Christian Today (a Japanese net media sit) in 2018:
Those who believe in God among American Protestants: 76%
Those who believe in God among American Catholics: 64%
Those who believe in God among American Jewish people: 30%
Globally, more than 70% of the mankind believe in existence of God, according to a Filipino paper. However, among 68 countries targeted in the survey, China has the largest ratio of people who don't believe in God: 67% of Chinese don't believe in God. Next to China, Japan has the second largest ratio of people who don't believe in God: 29%. Following Japan, the ratio of atheists is 28% in Slovenia, 25% in Czech, 23% in South Korea, and so on.
However, this kind of survey on belief in God must be useless in Islamic countries. Even Osama bin Laden was once popular among Muslims as a kind of Islamic savior, although he was the mastermind of the 9/11 Terror. God or Allah cannot approve such a killing.
Men have freedom to deny God. Men have freedom to sell their souls to Satan. And Satan is in money that is wanted by everybody. So, if a man said he believed in God while seeking wealth, we cannot believe his word or he does not understand God and Satan.
Those numbers of the ratios of believers in God in various countries are, therefore, not so reliable. Some don't understand what God means; others don't understand what believing means. Even we have to doubt the Pope in this context as he puts on expensive clothes. Also we have to doubt any leaders of Islamic terrorist groups.
M'r:7:6: He answered and said unto them, Well hath Esaias prophesied of you hypocrites, as it is written, This people honoureth me with their lips, but their heart is far from me.
To prove that a man believes in God, probably he has to be poor with less money, which is Satan, than religious people who might be, could be, and actually are betrayers of God.
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M'r:9:17: And one of the multitude answered and said, Master, I have brought unto thee my son, which hath a dumb spirit;
M'r:9:18: And wheresoever he taketh him, he teareth him: and he foameth, and gnasheth with his teeth, and pineth away: and I spake to thy disciples that they should cast him out; and they could not.