If paradise is heaven, we know that there is no flesh and blood in heaven, therefore how can there be literal horses?
Paradise is not heaven. Paradise is in heaven. So is the sea of glass. They don't seem to be the same location.
Jesus has flesh, and Jesus has blood. Are you saying that Jesus cannot be allowed into heaven?
We literally don't know much about heaven at all. We certainly should not say there is no flesh and blood there. There is no sin in heaven. There is no death in heaven.
How can there be literal flesh and blood on earth? The answer is simple. There is no separation between the physical and spiritual from God's perspective. Humans are blind to the spiritual reality around them. The physical is just as much a reality in heaven as it is on earth. Heaven is not separated from the physical. Heaven operates just fine. The physical is on the earth, because God created life that way. God also created the heavens to be as physical as well as spiritual.
Humans are so messed up with the virtual effects of science and science fiction, that no one knows the true reality of heaven. They seem to view heaven as some science fiction narrative. Then claim nothing can exist physically up there. What cannot exist in heaven is sin and death. That is only a reality on earth.
Heaven is probably stranger than the science fiction we are fed on earth. Satan is not very original. But to say how much similar would be only guessing. Paul could not describe it from a fist century perspective: 2 Corinthians 12:4
"How that he was caught up into paradise, and heard unspeakable words, which it is not lawful for a man to utter."
Paul is not saying they were a bunch of sinners breaking the Law. It would make sense that what went on in heaven was not expressable to those living in blindness on the earth. Now to the verse that many form this opinion on: 1 Corinthians 15:49-51
"And as we have borne the image of the earthy, we shall also bear the image of the heavenly. 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, but we shall all be changed,"
Paul is not saying the physical cannot be found in heaven. He is saying that this body of sin and death cannot enter the Kingdom without being changed.
The other verse is from Jesus own voice: John 3:11-13
"Verily, verily, I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness. If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things? And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven."
Jesus was saying humans don't go back and forth into heaven, which is true. Jesus never said they cannot go nor exist in heaven. Jesus was standing there talking to Nicodemus, and actually said the Son of man was in heaven. Was Jesus 2 places at the same time? Jesus was not physically on earth while spiritually in heaven. Jesus was making a point that He was without sin, while sin and death prevent humans from enjoying heaven. The point of Jesus being on the earth was to change humans back to the state they would be welcome into heaven not just spiritually but physically as well.
God was not separating the physical from the spiritual. God had to separate those of sin and death from the reality of those of life and spiritually whole. There have always been sons of God since the 6th Day, humans just like Adam and Eve. They were never involved in sin and death. They have been in heaven since before the Flood. But when Adam disobeyed God, he passed on sin and death to all his offspring. And that is who cannot enter heaven in their state of sin and death. Not until they are changed out of death into life.
What happens in heaven may not completely shock us like it did to Paul. We may relate more than Paul did. By this point, we should see it is us with issues, not heaven. Abraham lived by faith, but literally talked to the physical Jesus. Israel lived under the Law while the rest of humanity lived in fear and superstition. Now humans claim we can understand reality with science, literally knowledge. But that has placed too much emphasis on the physical. God never separated the physical and spiritual. God just could not let sin and death interact with the spiritual which was to represent God's holiness. The spiritual became just as wicked as the physical when the human spirit followed after Satan has demonic reality. God did not prevent that, but told humans to avoid that route at all cost. Humans still have the freedom to choose God or reject God.