Why did God only communicate only with the Jews? Was Adam and Eve Jews?
God has always communicated in several ways with both Gentiles and Jews alike. As others have already mentioned, Jews didn't even come into existence until Judah, Jacob's fourth son was born, so all those, like Adam and Eve, whom God communicated with prior to that were Gentiles. Also, God doesn't only communicate with people via the spoken Word. For example, He communicates with the whole world via creation which points us to our Creator:
Psalm 19 verses 1 thru 6
The heavens declare the glory of God; and the firmament sheweth his handywork.
Day unto day uttereth speech, and night unto night sheweth knowledge.
There is no speech nor language, where their voice is not heard.
Their line is gone out through all the earth, and their words to the end of the world. In them hath he set a tabernacle for the sun,
Which is as a bridegroom coming out of his chamber, and rejoiceth as a strong man to run a race.
His going forth is from the end of the heaven, and his circuit unto the ends of it: and there is nothing hid from the heat thereof.
Truly
day unto day utters speech and night unto night shows knowledge and there is no speech nor language where their voice is not heard, but are people listening or are they ever seeking to discount God by attributing His handiwork to such things as evolution and Mother Nature? The Psalmist said that
their line is gone out through all the earth and their words to the end of the world and Paul likened this to the gospel in his epistle to the Romans:
Romans chapter 10 verses 16 thru 18
But they have not all obeyed the gospel. For Esaias saith, Lord, who hath believed our report?
So then faith cometh by hearing, and hearing by the word of God.
But I say, Have they not heard? Yes verily, their sound went into all the earth, and their words unto the ends of the world.
Paul also said the following:
Romans chapter 1 verses 18 thru 20
For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness;
Because that which may be known of God is manifest in them; for God hath shewed it unto them.
For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:
All men are without excuse because that which may be known of God has been manifest in them in that God has showed it to them by displaying His eternal power and Godhead through creation and also in that God has given every one of us a conscience by which we may govern our thoughts in relation to that which is either right or wrong in God's eyes:
Romans chapter 2 verses 11 thru 16
For there is no respect of persons with God.
For as many as have sinned without law shall also perish without law: and as many as have sinned in the law shall be judged by the law;
(For not the hearers of the law are just before God, but the doers of the law shall be justified.
For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves:
Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another);
In the day when God shall judge the secrets of men by Jesus Christ according to my gospel.
Not being a respecter of persons, God has given to all, both Gentiles and Jews alike, a conscience which either accuses or excuses their thoughts and consequently their actions before Him and this is what Paul called
the law written in their hearts.
For instance, the Jews did not share the Torah?
The Jews did share the Torah, so I'm not sure what you're referring to. When God gave the law, as unpopular a message as it is today, He actually gave it to the whole world through the Jews that every mouth might be stopped and that the whole world might become guilty before Him and thereby recognize their need for a Saviour:
Romans chapter 3 verses 19 thru 23
Now we know that what things soever the law saith, it saith to them who are under the law: that every mouth may be stopped, and all the world may become guilty before God.
Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin.
But now the righteousness of God without the law is manifested, being witnessed by the law and the prophets;
Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference:
For all have sinned, and come short of the glory of God;
Why are Christians so special now?
We're special because of our relationship to Jesus Christ and that relationship is available to both Jews and Gentiles alike:
Galatians chapter 3 verses 26 thru 29
For ye are all the children of God by faith in Christ Jesus.
For as many of you as have been baptized into Christ have put on Christ.
There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus.
And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise.
It seemed like God did not reveal himself to non-jews. What's up with that?
Again, the problem isn't that God doesn't reveal Himself to all, but rather that many people willfully shut their eyes, stop their ears and harden their hearts to that which God has revealed unto them:
Matthew chapter 13 verses 13 thru 15
Therefore speak I to them in parables: because they seeing see not; and hearing they hear not, neither do they understand.
And in them is fulfilled the prophecy of Esaias, which saith, By hearing ye shall hear, and shall not understand; and seeing ye shall see, and shall not perceive:
For this people's heart is waxed gross, and their ears are dull of hearing, and their eyes they have closed; lest at any time they should see with their eyes, and hear with their ears, and should understand with their heart, and should be converted, and I should heal them.
