Trusting Jesus, the Son of God, is the ultimate requirement to know God and knowing God is eternal life. Eternal life is the most wonderful life possible but it will only get better if we seek to know God more.
Why would we not seek to know God more? God is the all wise and all loving creator of all things. If we have a friend who is an expert on something we tend to consult them when we need help in their area of expertise. If we have a friend who is an expert regarding car repair if our car has trouble we will call them up and ask them what to do right? Well God is the expert of everything. He knows all the best ways to do everything there is to do. Not only this but He always has our best interest in mind. So we should be joyously seeking God's wisdom about everything concerning our lives because He is the ultimate expert of life right? This is exactly what God wants. He invites all who come to Him to learn from Him (Matthew 11:29).
Jesus wants us to be His disciples. A disciple is a learner, someone who lives with their teacher and learns from Him. Jesus said, "learn from me" (Matthew 11:29) & "If you continue in My word, then you are truly my disciples" (John 8:31). One must intentionally (on purpose and with purpose) decide to "learn from Him" by "continuing in His word." One must learn who He is and follow Him as He guides.
Jesus calls all of those He has saved to be His disciple. You must willingly learn from Him. You must seek to know Him more. If we don't make the decision to learn from Him we will learn very slowly about God, if we learn much anything at all. The purpose of life is to know God and live in His love. The more we know Him the more lovable we will realize He is and we will love Him back more and more.
Proverbs 2:6-10 says, "Receive God's words and treasure His commandments within you, make your ear attentive to wisdom and apply your heart to understanding. If you seek wisdom as silver and search for it as for hidden treasures then you will understand what it means to honor the Lord, and you will gain knowledge of God. For the Lord gives wisdom, and from his mouth come knowledge and understanding. He stores up effective wisdom for the upright. He is their shield, protecting those who walk with integrity. He guards the paths of all who live honestly and protects those who are faithful to him. From God you will understand what is right, just, and fair, and you will know how to find the right course of action every time. Wisdom will enter your heart, and knowledge will fill you with joy."
It is easy to believe God exists. But to truly believe in God is to put your trust in Him to the point of learning of Him from Him and following Him in the knowledge and mystery of His guidance.