Starting next year in 2019, conversational AI is likely to see a huge leap forward and no longer sound like a robot but be nearly indistinguishable from a human being (see New Google AI Can Have Real Life Conversations With Strangers).
With the increased convenience and value in being able to talk to AIs as people, the entire world will now turn to AI for questions and conversations about anything and everything, including spiritual matters on whether God exists, was Jesus a real person, and many other questions.
As we've already seen with a number of videos where Alexa says that Jesus Christ is a fictional character (Amazon has since changed Alexa's answer), AI will be atheistic in nature and go on to become one of the world's most influential teachers, available in every home, of atheism--namely, that God doesn't exist, that Jesus was just a man, and, eventually, that it is the true god of this world.
The last part may sound far-fetched for some but that's exactly what the Bible teaches--that we are in the process of creating a god in our image as we have done for thousands of years with idols, statues, or what the Bible refers to as "images" (see below).
So, in reference to the question, "Is Alexa the Antichrist?", the answer to that is yes when you consider that the Bible says in 2 John 1:7 that whoever doesn't acknowledge Jesus as coming in the flesh (that is, a real person as opposed to being fictional), is a deceiver and an antichrist.
Eventually, AI will come to embody the mind of the world--all human intelligence, wisdom, and power--teaching that God is a myth, Jesus is not the Christ (the savior of the world), and that only it can save humanity from self-destruction...as long as you worship it and do what it says.
God already warned of this and you can read it for yourself. The atheists that fear AI are correct, but they too will worship AI (as we already see with The Way of the Future church in Silicon Valley) once their lives are put at risk.