'Careless' in the Bible

That [careless and unworthy participation] is the reason why many among you are weak and sick, and a number sleep [in death].

in which you once walked. You were following the ways of this world [influenced by this present age], in accordance with the prince of the power of the air (Satan), the spirit who is now at work in the disobedient [the unbelieving, who fight against the purposes of God].