For the non-believer, it's easy to doubt before making a commitment in wanting to know The LORD and what He says, mainly because of the doubt that the world creates in the mind of those without Christ. Especially if someone has already been emotionally burned by some previously joined mystical fraternity or religious cult.
It all boils down to who we listen to and trust; where we put our faith.
James 1:5-8
5 If any of you lack wisdom, let him ask of God, That giveth to all men liberally, and upbraideth not; and it shall be given him.
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.
8 A double minded man is unstable in all his ways.
KJV