"Now faith is the substance of things hoped for, the evidence of things not seen." Hebrews 11:1
"Through faith we understand that the worlds were framed by the word of God, so that things which are seen were not made of things that do appear." Hebrews 11:3
You do not need truckloads of faith to simply believe that what God said in His word is true. You need truckloads of study and advanced degrees to begin to understand the rational view of life. If you read the first two chapters of Genesis and you accept that God created the natural world, you are exercising faith. If you prayed a sinners prayer and were born again you have exercised faith. You do not need a whole lot of faith. You just need to use what you have.
In our text we read that faith has substance. Faith has evidence. Faith sees things and makes things and understands things about God. Faith is taking God at His word.
Science is exclusive, reserved for those with special knowledge. Faith is inclusive, anyone can believe in God and can live by His word. Faith is how we connect, and how we trust, and how we obey a God we cannot see. Rationalism is self centered and self exalting. Faith is Christ centered and God exalting. It is because they did not or would not honor God that God turned them over to wander in the wasteland of rational science, to waste their lives on things that do not matter.
Every time you pay your tithes, you have faith. Every time you pray, you have faith. You have more faith than you think. It only takes a little faith to do a whole lot.
"...and be not faithless, but believing." John 20:27b