What makes you think that Christians are better than non-Christians?"
A Christian is not a better person than a non-Christian, but he is certainly in better hands. Because a believer has Christ as his Savior, he is guaranteed to obtain the gift of eternal life.
A non-Christian has no advocate to intercede for him. Once he dies, he will have to face judgment alone. The Bible plainly says that anyone found guilty of breaking the commandments of God will be cast into the Lake of Fire.
“But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death” (Rev. 21:8).
"It is a fearful thing to fall into the hands of the living God” (Heb. 10:31). Because all have sinned and are in need of Christ’s forgiveness, it should be evident that Christians are no better than non-Christians.
"For by grace are ye saved through faith; and that not of yourselves:it is the gift of God: Not of works, lest any man should boast." (Ephesians 2:8-9)
It is not a matter of Christians thinking that they are better. There is nothing a person can do to earn their salvation. Instead, it is a gift of God, "not of works. lest any man should boast".