Why does God kill innocent children in the Bible?

Hmm, if you're referring to the Egyptians killed during Passover, God did it so the Pharaoh would let the Jews go. If you're bot talking about that, my bad.

I might ask if God indeed kill the first born sons of Egypt? But if God exists and he did indeed kill, then surely the God who gives life has the right too to take it away too. But that's more a rhetoric! May I know why you asked that question? Is that you've lost someone so dear recently or you are asking the question more as a philosophical problem?

remember that the english bible is but a translation of hebrew scriptures. the hebrew doesnt say that he killed the first born, for the word is "bekowr" and it is not a compound word, so niether the word first, nor born is part of this word. the english translations of hebrew scriptures are very deceptive, and unfortunately those who especially follow the english translations are most deceived as to what the hebrew scriptures actually say. people suppose hebrew scriptures are talking about what goes on in this world, but it really speaking about things going on in higher realms and in higher worlds. remember that the "gods" =elohim which is plural in hebrew, and not singular....that those who worship the gods must worship in spirit and in truth. and also flesh profits nothing..so those who try to understand hebrew scriptures from a fleshly point of view will never understand its meaning

Did a loving & merciful God really do that? The Holy Bible says so, so it must be true! First, we should check if we are understanding the message which the authors are trying to convey to us. We know that many books of the Holy Bible were written in many different writing styles. One of those styles in popular use at the time by certain people which was practiced for thousands of years is what we call allegory. Soon after the Roman Emperor Constantine threw his support behind the Church of Rome, the approved scriptures were canonized & all others were ordered destroyed. It was from that moment that it became heresy for the average person to possess or to read scripture for themselves. This lasted until Martin Luther's Reformation in the 16th century. From that time, it became possible for people to search the scriptures for themselves & draw their own conclusions. From about 325 ACE, the orthodox Church leadership permitted only priests & bishops to possess, read & teach the Holy Bible. They made it heresy for anyone authorized to teach scripture to interpret it allegorically. Only the most literal of interpretations was permitted. "With God, all things are possible" became the reason. Combine this aspect with multiple mistranslations, etc, etc & we have for ourselves quite a tangled mess when it comes to interpreting scripture. So, in conclusion, I don't so much or so quickly condemn what is written in the Holy Bible, but would rather be more inclined to check our own understanding of what is written. It all boils down to what sort of God you choose to believe in... a jealous, barbaric, blood-thirsty slayer of men, women & children who demands blood-sacrifice or a merciful, loving, compassionate, forgiving, intelligent, creative God. You choose.