At the end of time God will call His faithful people out of Babylon (the apostate Christian churches) and into His remnant Church.
Revelation 18:4
This shows us clearly that at the present time there are many of God's true people in the wrong Churches, due to ignorance, which God will illuminate with the truth and draw out in the last days. Specifically Babylon refers to an apostate (non-Biblical based) system which does not follow ALL the commandments of God. Sin is the transgression of the law, and Churches who teach that only 8 or 9 of the commandments are relevant are teaching their children to sin. One Christian denomination remove the second Commandment relating to idols worship from their official list of the Commandments, and changed the fourth Commandment to Sunday in favour of the pagan sun worship day. God commanded that His special Holy day of worship should be the seventh day, which is a SIGN that it is God we worship and in Honour of His wondrous works of creating this world in 6 days. This Christian denomination that their authority overrides that of the scriptures and promote the fact that they changed the Sabbath to Sunday and all the other Churches follow their decree of proof of their power. Many others denominations, which stemmed from Protestant revolt against this apostate Church in the dark ages, claim to used the scriptures as their only source of doctrine but still omit to fulfil this belief, as they do not uphold God's original Holy day of worship, but continue on keeping only nine of the Commandments. Sunday keeping has become such a tradition, that the people in many Churches have blinkers on and are ignorant of the fact that they are breaking one of God's Holy laws. Bible prophecy tells us that at the end of time, God will shine forth the truth of His Word and His Commandments to these Churches and those who love Him enough to keep His Commandments in the way He ordained, will been drawn out of this apostate system and become part of the remnant Church, the true chosen people of God. Revelation describes the two opposing sides at the end, Babylon the (apostate Church) or in other passages referred as a harlot woman riding a beast, and the true Church which is depicted as a woman in white. Those in Babylon get the mark of the beast and those in the remnant get the seal of God. There are no other categories, at the end of time everyone on the whole world will be one group or the other, which is why it is so important to find out how to become part of the true remnant and avoid the wrath of God.