When the Rapture comes, will all the children be taken also? Or will only the believer’s children be taken? When Israel went into the Promised Land, the heathen’s children were not spared.

I Corinthians 15:50,51, in speaking of the Rapture says, "Now this I say brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption. Behold, I shew you a mystery; We shall not all sleep (die), but we shall ALL be changed". The "all" would include even babies who are also part of the body of Christ. Those children, the second group, that are of the age of accountability will be left behind.

You mention the children of the heathen parents whom God had ordered the Israelites to kill. Those heathen children, under the age of accountability, upon death would enter the kingdom of God. Had God allowed them to continue, they would have been taught to worship other Gods as their heathen parents did. Thank God for His wisdom and grace. God allowed the children to die, so they could live with Him eternally in His kingdom; instead of allowing the parents to raise them as heathen, destinate for an eternal Hell. Sometimes we need to look at things through God’s eyes, instead of our own. I hope this helps.