To a Believer, God can say this statement. The difference between a Christian Believer and others is the point of reference. A Christian by definition believes in a source higher than their own wisdom or any human wisdom.
Ummm, when did God "say" this to you? If you say the Bible, you are taking some human's word that "God" talked to them and that they got it straight. Whatever higher wisdom there may or may not be, a human has to decide that it is wisdom. In other words they have to use their wisdom to evaluate it. So, it's a misrepresentation to claim that they believe in a "higher wisdom", it's self deception, as their own wisdom is what is passing judgement on the truth or falseness of this claimed "higher wisdom".
A Christian, like any other religionist relies on the authority of others who claim to have "the" truth from a "higher" authority. This is a long standing human cultural psychological situation. It has worked and continues to work for very large group cohesiveness and it does provide psychological support to individuals. This comfort has been offered here as an explanation of it's "truth". The mind uses many things effectively to provide happiness and even healing. However, humans being what they are disagree and this disagreement can become violent.
It's just not the violent conflicts between differing religions or sects alone but that is one symptom of the human origins. Now humans are clever rationalizers and very good at arguments to support their belief that they are right. For example, they don't say "I am right" they say "God is right, and I know exactly what God wants and you don't, HAH!". And then they demonize those who disagree. I mean I've read here that some of you Christians believe other religions are the result of the activity of demons.
Poor scientist, they aren't allowed to quote friend's vivid visions, hallucinations, intuitions, hunches as proof of anything. Human belief can have powerful effects on individuals and groups, but that in no way establishes the "truth" of the belief. It CAN establish the desirablity of the belief for some people.
The conversion activity is irrational or flawed logic used to sell things, religion, deordorant etc all use rhetoric that has emotional appeal to the insecurities of the ego. "Buying" a religious or any other persuasion results in a psychological satisfaction. At this point in history the value of that probably still out weights the social problems and conflicts it causes.
Religion isn't about getting to heaven or saving souls, it's about managing behaviours and feelings in this world by the use of imaginary rewards and punishments. Some would rely primarily on reward systems, other favor punishments, "threaten 'em with hellfire if they don't submit to your authority". Or worse, witness the Inquistitions, witch trials, and as mentioned here Jihads.
So, yes, religion can be helpful to people, especially depressed or substance addicted or anxious individuals. On the other the price we pay is written in the history of the wars and persecutions.
There are other approaches to relgion. Buddhism has some significant differences but that is not on topic here.
peace,
lfen