Why is President Obama considered the "AntiChrist" by some religious groups?

Very, very easy to answer your question. In the book of Revelation, you can read about two "Antichrist", one is a political leader the other one is a religious leader, MUSLIM. The political leader is going to betray Israel, and the way Obama is treating Israel and all the insults given to the president of Israel by president Obama is a sign of his roll in the end of times.