The original question was:
"Who was the first Gentile to be saved and how/why did it happen?"
The answer was given as the Ethipian eunuch as mentioned in Acts.
Then, we took a turn and Krazee mentioned the quasi- incompatibility of being a eunuch and being circumcised (paraphrasing...)
I mentioned, and it's true, that for a Righteous Gentile circumcision is not needed, unless he also wants to become convert.
So, it was merely a possibility which would have avoided the issue of circumcision (re trying to decide if this man was a Gentile, a Righteous Gentile or a Jew).
I know that there is more to consider, and we might approach these things from different angles. However, among the ones you mentioned to consider:
1) Was Jeremiah, Daniel, Apostle Paul and Jesus eunuchs?
Not that we know of... There is a difference between choosing celibacy and sexual purity and being physically castrated.
2) Did any of them had sexual organs removed, as in (Deu 23:1)?
Not that we know of, but they were all circumcised male Jews.
3) Was they allowed to worship in the temple?
Yes, if and when there was a temple standing and they were able to go to Jerusalem...
"I need to see the scripture that say Eunuchs is not allowed in the temple to worship and that they had their sexual organ completely or partially removed."
Well, for the second part, I don't think that scripture goes so far into the details of castration techniques
As for Eunuchs and Gentiles being allowed or not in the temple to worship, there might more things to consider when it comes to this Ethiopian eunuch and others.
How do we decide if he was a Gentile or a Jew? He did things that obedient Jews did:
- He came to Jerusalem to worship
- Also, the scripture says "Then Philip ran up to the chariot and
heard the man reading Isaiah the prophet."
That's called "Haftara".
What is Haftara?
"Jews read Torah out loud each week in synagogue in an effort to become more learned about their Jewish heritage.
There were many periods in Jewish history when the powers ruling over the Jews sought to destroy Jewish religion and culture by banning Torah reading. To circumvent these efforts, Jews would read portions from the unbanned Book of Prophets in place of the Torah.
The Jews would choose a section each week from the Book of Prophets that was similar in some way to the Torah portion that was supposed to be read that particular week.
Haftara refers to the Book of Prophets reading that follows the Torah reading on Sabbaths and holidays."
So, he was certainly behaving as an observant Jew.
For scriptures related to eunuchs and what they were allowed to do or not:
Commandment 106 : "Not to castrate the male of any species;
neither a man, nor a domestic or wild beast, nor a fowl (Lev. 22:24) ."
Commandment 389: "That a person with a physical blemish shall not enter the Sanctuary
further than the altar (Lev. 21:23) (negative)."
Leviticus 22:3 "Say unto them, Whosoever he be
of all your seed among your generations, that goeth unto the holy things, which the children of Israel hallow unto the LORD, having his uncleanness upon him, that soul shall be cut off from my presence: I am the LORD. "
Then again, there is this word from the book of Isaiah:
"Isaiah Chapter 56
3 Neither let the
alien, that hath joined himself to HaShem, speak, saying: 'The HaShem will surely separate me from His people'; neither let the
eunuch say: 'Behold, I am a dry tree.'
4 For thus saith HaShem concerning the
eunuchs that keep My sabbaths, and choose the things that please Me, and hold fast by My covenant:
5 Even unto them will I give
in My house and within My walls a monument and a memorial better than sons and daughters; I will give them an everlasting memorial,
that shall not be cut off.
6 Also
the aliens, that join themselves to HaShem, to minister unto Him, and to love the name of HaShem, to be His servants,
every one that keepeth the sabbath from profaning it, and holdeth fast by My covenant:7 Even them will I bring to My holy mountain, and make them joyful in
My house of prayer; their burnt-offerings and their sacrifices shall be acceptable
upon Mine altar; for
My house shall be called a house of prayer for all peoples.8 Saith the Lord GOD who gathereth the dispersed of Israel: yet I will gather others to him,
beside those of him that are gathered."
Finally, I can hardly see this man being rejected when he went to worship. If nothing else, he was a dignitary of the court of the queen of Ethiopia, he obviously traveled with an entourage, his visit regardless had an official aspect which cannot be ignored because of his position.
Also, to this day, Gentiles are allowed to attend services in synagogues, as long as their behaviour is respectful and he/she submits to the few rules which exist...