Every word of God has meaning, therefore, the kingdom of heaven is not the same as the kingdom of God. Simply put, the word heaven and God are not the same and are not interchangeable. God created the heaven. God is a spirit, heaven is a physical place.
Mat 18:3 And said, Verily I say unto you, Except ye be converted, and become as little children, ye shall not enter into the kingdom of heaven.
Mar 10:15 Verily I say unto you, Whosoever shall not receive the kingdom of God as a little child, he shall not enter therein.
Luk 18:17 Verily I say unto you, Whosoever shall not receive the kingdom of God as a little child shall in no wise enter therein.
Mat 19:14 But Jesus said, Suffer little children, and forbid them not, to come unto me: for of such is the kingdom of heaven.Luk 18:16 But Jesus called them
unto him, and said, Suffer little children to come unto me, and forbid them not: for of such is the kingdom of God.
Mar 4:30 And he said, Whereunto shall we liken the kingdom of God? or with what comparison shall we compare it
Mar 4:31
It is like a grain of mustard seed, which, when it is sown in the earth, is less than all the seeds that be in the earth:
Mat 13:31 Another parable put he forth unto them, saying, The kingdom of heaven is like to a grain of mustard seed, which a man took, and sowed in his field:
Mat_19:24 And again I say unto you, It is easier for a camel to go through the eye of a needle, than for a rich man to enter into the kingdom of God.
Mar_10:25 It is easier for a camel to go through the eye of a needle, than for a rich man to enter into the kingdom of God.
Luk_18:25 For it is easier for a camel to go through a needle's eye, than for a rich man to enter into the kingdom of God.