There seems to be a muddle between anti-christs (Strongs word 500) which is a very literal translation of the Greek anti-christos which simply means against Christ and therefore is almost self evident in the 1 John passages. What is being said is that if you are not for Jesus Christ, you are against him -no middle gorund - quite simple really.
The Anti-Christ that most people think of is actually the 'False Prophet' (Strongs word 5578), this again is a very literal translation of the Greek pseudoprophetes. This is one person working for 'The Beast' (Strongs word 2342) 'therion' literally a dangerous or venomous wild animal, in this case referring to Satan.
The only other use of pseudoprophetes (5578) is in Acts 13 and refers to a man called Barjesus in Hebrew. It is as follows (NIV translation):
6.They travelled through the whole island until they came to Paphos. There they met a Jewish sorcerer and false prophet named Bar-Jesus,
7 who was an attendant of the proconsul, Sergius Paulus. The proconsul, an intelligent man, sent for Barnabas and Saul because he wanted to hear the word of God.
8 But Elymas the sorcerer (for that is what his name means) opposed them and tried to turn the proconsul from the faith.
9 Then Saul, who was also called Paul, filled with the Holy Spirit, looked straight at Elymas and said,
10 You are a child of the devil and an enemy of everything that is right! You are full of all kinds of deceit and trickery. Will you never stop perverting the right ways of the Lord?
11 Now the hand of the Lord is against you. You are going to be blind, and for a time you will be unable to see the light of the sun. Immediately mist and darkness came over him, and he groped about, seeking someone to lead him by the hand.
12 When the proconsul saw what had happened, he believed, for he was amazed at the teaching about the Lord.
This person has to claim to be a prophet, one anointed by God and so I cannot see how Bush could fit the bill, whatever you think of him.
Many people will be deceived (according to Revelation) so that could easily include people from all religions. Whether the majority of Jews are likely to regard him as their awaited messiah I am not really able to say (as I am not Jewish) but it would seem a pretty tall order to get one person who would appeal to the secular non religious westernised world and to orthodox Jews at the same time. For the latter, he would have to be Jewish of course and there is no mention of this, which is surprising if that is to be so.
All Christians (forearmed with both Daniel and the Book of Revelation) certainly should not be fooled - but there will be great economic pressure to follow the False Prophet so although we know that some will not be fooled, we cannot say more than that - only God knows. There are prophecies of a widespread return to God and an acknowledgement of Jesus by Jews in the last days and there is no doubt that even though it is still very small, messianic Judaism (Jews who have become christians) is increasing steadily.