Here are some things to consider, if you believe, like most adherents of christianity, that the feasts were ended at the cross:
Messiah’s crucifixion was the fulfillment of Passover, so if the feasts ended at that point, then there is no righteousness available for humans, as the Passover is the preparation for Unleavened Bread, which is AFTER Passover (after the cross), and it represents the righteousness that comes after belief in Messiah and His sacrifice on the cross—and Unleavened Bread was fulfilled by Christ’s sinless body being buried in the ground (which was after the cross).
Messiah’s resurrection could not have occurred, as it was the fulfillment of the Feast of Firstfruits, which began the spiritual barley harvest. That harvest represents the winnowing of those who are His bride—the “catching away” of their souls to heaven. It was also Messiah’s victory over death and hell, which is the promise given to all who are in Him. Without Firstfruits there is no such promise.
The seal of the Holy Spirit would never have been given as the new covenant to the Lamb’s bride, since that happened 49 days AFTER the resurrection, which was the Feast of Weeks (Acts 2). That feast commemorated the giving of the old covenant (Ten Commandments, physical), and its fulfillment was the giving of the new covenant (spiritual), which is the seal of the Holy Spirit. That is the day He was poured out as the covenant upon physical Jews and Gentiles alike, as Messiah broke down the barrier that separated them—physical circumcision and the clean vs. unclean laws.
These are things that could not have occurred if the feasts were ended at the cross. And, they represent just a few of the many events that are revealed in the prophetic calendar. All of the coming things are shown by the Father’s traditions—the Sabbaths, the wedding traditions, the harvests, the temple ordinances and practices.
It is both laughable and pitiful hearing christians speak emphatically about their interpretations of the “end times” when they are wholly ignorant of the traditions. That is just a mixture of human pride and demonic deception. There is no way to know and understand fully the events that are coming apart from knowing the Father’s traditions.
I’ve got friends who state vehemently that they “know” there is no rapture—because they don’t even know what that is, nor do they understand that the rapture (winnowing) of the bride has been happening since she was established on the earth 49 days after Messiah’s resurrection.
What typically goes hand-in-hand with those eschatological false beliefs are most often false beliefs concerning the doctrines of justification (salvation). These folks usually preach a salvation that is dependent upon man’s works to provide “evidence” of salvation—ongoing repentance of sins of the flesh to “maintain” salvation or prove that someone was even saved in the first place. They typically think that salvation is obtained by a decision, or a prayer, or asking Christ into their hearts, or turning their lives over to Christ, or by obeying the commandments.
It’s mostly sad. But, usually, such folks think they’ve got it all figured out, and carry on with their false beliefs, not even realizing that they, themselves, don’t have what they think they do, and will end up being described by Matthew 7:21-23. However, to talk to many of them today, they will say, “I know that I know that I know” as if such a declaration proves their salvation. They scoff at the truth, and claim that what they believe is truth, but it’s just an eternal tragedy for them.
For more information: The Feasts After Passover