Paul
Every rational person knows Jesus Christ existed, even most atheists. "Believing in" Him goes much deeper that that. It means meeting Him, coming to know Him, and living in daily relationship and communication with Him.
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John 8:24, the sermon on the mount (Mt. 5-6-7), along with Lk. 13:3, Mt. 10:32, Mark 16:15-16, Rev. 2:10.
Campbell Hayden
How does one "believe in Jesus"? = Who cares.
Jesus Christ is a failed messiah, a fraud,
an emotionally unwholesome fool, and a dead man.
Unless Jesus is raised up somewhere and dangling from a cross,
he will never be far enough off the ground not to be dirt.
Always remember:
Those of the Christ-based faiths will never be proof of what they believe in.
Lynnmarie
By admitting to God that you are a sinner and humbly asking His forgiveness.
And by realizing that Jesus Christ (God in the flesh) died for your sins and rose again the third day to secure a home a heaven for you. And by asking Jesus into your life as Lord and Savior and following Him.
Your Word is a light to my roadway
One must exercise faith in Jesus Christ and do God's will. Those who go to heaven are spirit anointed by God and chosen to serve there. They are a small number, a "little flock" numbering only 144,000. The rest of obedient mankind will live eternally on earth as subjects of God's Kingdom.