For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end.

Hebrews 3:14 KJV

We are made partakers of Christ but we must not leave out the part of this verse that says we should hold the beginning of our confidence steadfast until the end. This walk with the Lord is one of endurance. There will be bumps and curves along the way. We must keep our faith in Jesus Christ, no matter what obstacles come our way. You can believe in Christ for the most part of your life but, then, due to hardening of the heart, develop unbelief and not make it to heaven. You can’t just believe at one time in your life. You must always believe in Jesus Christ being Lord and Savior. Life can and will throw some things at you to try to cause doubt and unbelief. Keep believing.