But for that, we have to have conviction, and no doubts about Christ´s resurrection, and all the facts that happened in the Bible, that we didn´t see, but believe, Just like Jesus said to Thomas - John. 20:
29- (...) because thou hast seen me, thou hast believed: blessed [are] they that have not seen, and [yet] have believed.
Doubt is the opposite of faith, and the Devil planted doubt, division, confusion and dissension, with this many religions and Christian denominations.
Many will lose salvation.
The Best thing we acquire in this life.
The worst thing that can happen in this world is someone think is been saved, and wind up in hell.
Because people have the Bible, know how to read but don´t read it. With this confusion, unbelieve, by the example of the preachers. And the way people are, like Thomas was, see

it to believe it, there is a dispute. The priests with their plaster idols.
And the pastors, healing and making prodigies. Saying they come from God. So, people have faith in many things, all but real God. God will never do something against his Word, so people continue wrong, going after idols, talismans, etc. James 1:
5- If any of you lack wisdom, let him ask of God, that giveth to all [men] liberally...
6- But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed.
7- For let not that man think that he shall receive any thing of the Lord.
Hebrews 11.6:
6- But without faith [it is] impossible to please [him]: for he that cometh to God, must believe that he is, and [that] he is a rewarder of them that diligently seek him.