Believing in God and trusting him goes together. Believing in God’s existence is not enough. Demons know that God exist also. John 2:19 tells us, “You believe that God is one; you do well. Even the demons believe—and shudder!” Actually, demons are a step ahead of those who approach God as if He is a mere human; demons have enough sense to also tremble. Furthermore, God’s existence is really undebatable. Romans 1:18-21 tells us, 

For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth.19 For what can be known about God is plain to them, because God has shown it to them. 20 For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse.21 For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. (ESV)

This verses clearly tells us the truth about Atheism… it does not exist! What is real is hatred against God, rebelliousness, ungodliness, unrighteousness and suppressors of the truth. However, the existence of God is, as the Bible states, in plain sight. The issue for humans is not God’s existence but trusting him. As a matter of fact, Hebrews 11:6 tells us, “…without faith it is impossible to please him, for whoever would draw near to God must believe that he exists and that he rewards those who seek him.” (ESV) 

Notice that just believing in his existence is nothing special; there must be trust in knowing that there is a reward for those who trust Him no matter the circumstances.  Folks who fall apart over every challenge or obstacle in life are not placing their trust in God; they are placing the problem above God’s power and that my friend, is very offensive to the Almighty. That is why without faith it is impossible to please God. It amazes me that faith is so important that is not only a fruit of the Spirit (Galatians 5:22), but also a gift of the same Spirit (First Corinthians 12:9) and, a crucial ingredient in our own salvation (Ephesians 2:8).