The basics of living in the Light of God and his Son Yeshua the Christ is to atone for one's sins. The Torah provided very specific instructions for the atonement of our sins. The brazen altar or altar of sacrifice was the first stop before entering the tabernacle. One would have to atone for his sins, by sacrificing an innocent animal, before they would be permitted to go anywhere near the tabernacle.
“He is to lay his hand on the head of the burnt offering, and it will be accepted on his behalf to make atonement for him.”
One's sins was transferred to the animal, then the animal was sacrificed.
“For the life of a creature is in the blood, and I have given it to you to make atonement for yourselves on the altar; it is the blood that makes atonement for one's life.”
The single door into the tabernacle was representative of the single path to salvation found in Yeshua the Messiah, the Christ, the WORD made Flesh!
The sacrifices for sin ceased when Christ was resurrected.
10By the which will we are sanctified through the offering of the body of Jesus Christ once for all.
11And every priest standeth daily ministering and offering oftentimes the same sacrifices, which can never take away sins:
12But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God;
13From henceforth expecting till his enemies be made his footstool.
14For by one offering he hath perfected for ever them that are sanctified.
15Whereof the Holy Ghost also is a witness to us: for after that he had said before,
16This is the covenant that I will make with them after those days, saith the Lord, I will put my laws into their hearts, and in their minds will I write them;
17And their sins and iniquities will I remember no more.
18Now where remission of these is, there is no more offering for sin.
19Having therefore, brethren, boldness to enter into the holiest by the blood of Jesus,
We can atone for our sins by praying to Christ. The sacrifices are no more and that single door into the tabernacle represents Christ, the one door, the only door for salvation.