Wes

You said:
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It comes down to this. Those who believe in an "age of accountability" put the emphasis on man's choosing because they believe in man’s free will. This is a serious error. Salvation is of God's will, on whosoever He will, not of man's free will. So those who hold this "age of accountability," see their children in some sort of probationary state and don’t believe in God's Sovereign right to save whoever He chooses and not be in obligation to save only those who choose Him.

Wes, as you probably know even CH Spurgeon believed in an age of accountability. I could list quite a few big names today that also do and they don't believe man has a free will.
Just so you know, I lean towards there not being an age of accountability, but I am not dogmatic about it.