The greatest commandment is to love the Lord your God with all your heart, soul and mind. Ever think about this?
Note that the greatest commandment is not “believe the Lord your God.” Faith is not at issue in this commandment, love is.
However, in order to follow a commandment of God faith is necessary. As Paul says in Galatians, “faith works by love.”
But note that phrasing as well–love does not work by faith. As Vincent’s Word Studies puts it–“faith is wrought by love.” In the context, faith is not in circumcision, an outward fleshly act, but by an internal circumcision of the heart–love.
And, as Paul says eight verses later–all the law is fulfilled in one word, love. Love fulfills the Law. Do we fulfill the law by faith? It depends: is your faith wrought by love or self-effort? “Though I have all faith, so that I could remove mountains, and have not love, I am nothing.”
Without love, faith is not possible.