Why God allows wicked man to exist?
God is Just. If he were to punish one wicked man, then He has to punish all wicked man.
I don't have enough faith to claim to be a good man.
2 Peter 3:9
New King James Version (NKJV)
9 The Lord is not slack concerning His promise, as some count slackness, but is longsuffering toward us,[a] not willing that any should perish but that all should come to repentance.