Well there is two major things wrong with this theory. One. How can an planet sized object get close enough to collide with us without being seen by any space or ground based telescopes? That does not even factor in the radar or radio based telescopes.
Two something this size would be visible to the naked eyes no matter what direction it is coming from. There is no way the general population would not see it. Or does this planet sized object have a cloaking device on it.
It is still very easy to debunk this theory as how does one hide a planet sized object heading our way. Whether you look in the sky during the day or the night if there was a planet heading towards us we would see it coming from a long way off. I think that this is not going to happen this year.
You have to remember ever since the book of revelations was published everyone has been reading it and looking for the signs that would spell the end of days. You can read this book a dozen times and come up with a dozen different answers. I think this is what this guy is doing thus he is not sure when it will happen or how it will happen. No one knows when the end of life as we know it will happen but I can tell you it will be in a time of war. According to the book of revelations. Or at least that is how I interpret it.
Well that is the thing. In the end of the days will be the true belives being taken in the rapture thus many people will go to the promise land. What is left is those who's faith is weak or non existent. During those times people will have to learn to understand what has happened and learn to either accept the faith or forever be denied the future. That is what I believe. I could be wrong like this guy seems to be a lot but there will be still be people he can say "See I told you so"