Intellectually believing in Christ is only part of the equation for 'following Him and accepting His teachings, His Gospel." One way of coming to an understanding of what it truly means to follow Christ would be to use a Bible verse that provides a spiritual equation with math like efficiency as to what it really means to become a Christian.
John 1:12 is just such a verse: "Yet to all who received Him, to those who believed
in His name, He gave the right to become children of God."
Those verbs make up the equation: believe + receive = become.
To believe is intellectually to agree that Christ sacrificed Himself to pay for the wrongs we've committed. That is a most important point. Many sit in churches for years, stuck in that seat, and they wonder why their spiritual life is ranges from little to none, stagnant. The next verb in the equation is critically important, as well. We need to receive God's free offer of forgiveness and eternal life. We have to claim it for our very own, because until we do that, it's not ours; it is just something we know about floating around in our head. So it is imperative that we admit our sinfulness, turn away from it, and humbly accept Christ's payment on our behalf.
If that does not make sense, here is another verse in which Jesus makes it pointedly clear: "I have not come to call the righteous, but sinners."
And, our greatest sin against the Body and Blood of Christ is to live for the self. Mother Teresa so pointedly has said it better than I: "A live not lived wholly and completely for others is no life at all, it is merely an existence." Our greatest sin is to live for the self rather than others, as He lived His life, which is to be an example for our lives.