Believers come in all intensities - so do non-believers.

For sure agnostics are non-believers, non-religious do not except any higher power and are for all intents and purposes are non-believers.

"Deaths in the Bible. God - 2,270,365
not including the victims of Noah's flood, Sodom and Gomorrah, or the
many plagues, famines, fiery serpents, etc because no specific numbers
were given. Satan - 10."