"The one big problem with the rational mind(reasoning out things) is that they assume that they know the truth about everything already."
Untrue. That would be irrational and unreasoning. We do accept proven facts as facts and we do not accept that for which no evidence or only poor evidence exists.
"So they start out in their thinking with the assumption that they can know."
Yes, I believe that given enough time and effort humans can know many many things; many things which the human race does not know now. However, I do not claim that everything is knowable. That, too, would be irrational.
"But what does the Word of God say: unless you become as a little child, you will by no means enter the kingdom of God."
Yes, imagine that, the scriptures of a group trying to sell you a delusion says that you shouldn't think deeply about their irrational statements, you should believe what they tell you.
"And a little child just believes everything you tell them. Well that is what the Word of God says, just believe what the Word tells you."
Indeed. That's not a good thing, Squeaky.
"In reality the Word is saying believe it first and then God will open your understanding."
The path to understanding doesn't require one to swallow ridiculous and patently false assertions. That's the path to delusion and intellectual dishonesty.
"But the rational mind says dont believe nothing until you have good reason behind it."
No. First, most rational persons would use better grammar than that. Second, the rational mind believes that for which there is the best avalable evidence and allows for correction if better evidence comes to light.
"This is the difference between accepting it on faith, and reasoning it out according to mans wisdom."
True. Faith is the belief in an assertion for which there in no supporting evidence. Remember, that isn't a good thing.
"The Word accually says to first repent then believe in the gospel."
Until you provide good evidence supporting the gospels, I will not believe them. You can start by proving that God and Jesus exist.
"It doesnt say reason it out until it says what you want it to."
No. The Bible says little in favor of reason and nothing, so far as I remember, in favor of intelligence. That's one of the big problems with Christian scripture.
"To many have a pre-conceived idea planted by some man before they open the bible. Then they search to find something that supports their already pre-conceived idea."
True, some of us have learned to reason before we read the Bible. We have pre-conceived ideas such as if to statements conflict, at least one of them is not true, and don't believe assertions just because the fairy tales of ancient desert bumpkins tell you to.