Is an Angel a spiritual specie or a alien specie ?
The word "species" is a strange choice of words. While technically the word species, in its etymology, simply means "kind" or "a sort"; in common usage it has a more specific biological meaning which only applies to biological creatures in the context of cladistics.
The term "alien", as you are using it here, seems to be the popular modern meaning of a creature from outer space, or a creature from a distant planet. As such this term is entirely inappropriate for speaking about angels.
Angels are creatures, made by God, that exist apart and distinct from material reality. That is, angels do not have physicality, materiality, or corporeality. The ways Scripture speaks of them is to describe them as messengers of God (both the Hebrew and Greek words used of them mean "messenger" when translated into English), which exist outside the ordinary visible, observable world; their appearance can vary greatly based on descriptions found in the Bible in both encounters and in visions (e.g. Isaiah's vision of the seraphim, or Ezekiel's vision of the ophanim).
More explicit, the Bible refers to angels as "ministering spirits" and "flames of fire" indicating their noncorporeal nature; these are not creatures of solid matter, but ethereal, immaterial, non-corporeal, etc.
They are a kind of creature, made by God; and they serve Him in ways which Scripture sometimes describes; but are primarily unknown to us. So unknown, in fact, that the author of the Epistle to the Hebrews suggests that it is possible when we welcome guests into our homes, we may in fact be entertaining angels unaware.
Is infant baptism justified ?
Yes. The Lord Jesus when He instituted the command to His Church to baptize does not prescribe conditions on who may be baptized based on things like age; but rather the charge given to the Church is to all nations. That is, to all peoples, of every sort, everywhere. And, indeed, the Lord rebuked His disciples when parents brought their infants and small children to Him and they (the disciples) tried to prevent them from doing so. The Lord saying "do not prevent the little ones from coming to Me, for to such as these belong the kingdom". In the Acts of the Apostles we read of several times when entire households received baptism; in the ancient world a household was a multi-generational family unit that also included household slaves and servants, parents, uncles, aunts, grandparents, young children, infants, etc. There is no indication of anyone in the household being excluded; but speaks of the entire household receiving baptism.
Further, in his letter to the Colossians, St. Paul uses the language of circumcision when talking about baptism; that baptism is a spiritual circumcision made without hands; in the Old Testament and in Jewish practice which Paul and all the Apostles were intimately familiar with, male infants are circumcised, both when a child is born to Jewish parents and also when non-Jews converted to Judaism the children were converted also--that conversion included a ritual bath (the Jewish antecedent of Christian baptism) as well as circumcision of male children. There is no reason to imagine that any of the early Christians would have, given the Jewish context of their faith, excluded children from baptism
Is rapture true or false ?
That depends on what you mean by the word "rapture". The popular Dispensationalist idea of Christians disappearing some day, in the Left Behind sense, well no that's not true. That's unbiblical and was believed and taught by nobody in the Christian world until the 1800s.
If by "rapture" you simply mean that the Faithful will, at Christ's glorious return, be raised up from the dead (and those living likewise being transformed) and going up to meet the returning Lord Jesus, as described in 1 Thessalonians ch. 4--that's true. Not beamed up into heaven, but rather brought up to meet Christ as Christ descends and returns. Like the citizens of a city going out to meet their king when the king returns.
Can a fallen angel or a fallen nephilim be saved ?
Scripture offers us no information about whether fallen angels can be redeemed.
And the nephilim were simply ordinary human beings, no different than you or me. The idea of half-human/half-angel hybrids is pure fiction.
How is accuser so interested in USA nation and USA people by sending his fallen angels pretending to be aliens ?
I don't know what you are talking about.
I don't believe that aliens have ever visited earth. And I don't believe that such non-existent aliens are fallen angels/demons. And I don't believe that the devil is doing anything like that. There is no evidence to support any of these ideas.
If there are "aliens", e.g. living beings on other planets or other parts of the universe, they almost certainly have never visited earth. And it is highly unlikely they ever will, or that we will ever meet them. There's simply no way of knowing if "aliens" exist at all. As far as we can tell the natural rules that govern the universe prohibit traveling faster than light, and the time it would take to traverse the distance between stars is something to be measured in tens of thousands, hundreds of thousands, and even millions of years--just within our own galactic neighborhood. That makes the idea of popular sci-fi trope traveling to different planets and star systems closer to fantasy than actual science.
Star Trek isn't ever going to become real.
Is Accuser and his fallen angels pretending to be aliens trying to create another generation of nephilim by abducted humanity ?
No.
Can people how become something else because of extreme body modification , cyborg and people how suffer every size/mental/physical problem be spiritual saved ?
A person with a prosthetic or a pace maker is still human. A person with a heart or liver transplant is still human. Salvation is for all people, for Christ, God the Word, became man, suffered and died, in order that we might be saved and to know God and to have new and abundant life forever.
-CryptoLutheran