No. There is no objective evidence that proves the apostasy as a historical event. It is the province of Mormonism primarily.
Apostasy is very much a universal Christian concept and belief. But you think sexual sin is OK, and that man laying with man, as with a woman, is not homosexuality, and that the church is a living organism in which we can rely on the testimony of Joe Blogs rather than get one ourselves. You also believe that the bible was not inspired by God, that you are an apostolic clergy, that the Pope has got it all wrong, that you have to be a member of a congregation to be a Christian, that the Bible is all about living in communities and that God can make mistakes. You haven't said, maybe because out of embarrassment, but you probably believe in the trinity as well. Just a few of your very unusual beliefs.
I believe in the Perfect Plan of Salvation and all that it entails, including free agency and personal revelation.
Christianity
The Christian understanding of apostasy is "a willful falling away from, or rebellion against, Christian truth. Apostasy is the rejection of Christ by one who has been a Christian ...", though many believe that biblically this is impossible ('once saved, forever saved').
[45] "Apostasy is the antonym of conversion; it is deconversion."
[46] The Greek noun
apostasia (rebellion, abandonment, state of apostasy, defection)
[47] is found only twice in the New Testament (Acts 21:21; 2 Thessalonians 2:3).
[48]However, "the concept of apostasy is found throughout Scripture."
[49]The Dictionary of Biblical Imagery states that "There are at least four distinct images in Scripture of the concept of apostasy. All connote an intentional defection from the faith."
[50]These images are: Rebellion; Turning Away; Falling Away; Adultery.
[51]
Apostasy is certainly a biblical concept, but the implications of the teaching have been hotly debated.
[53] The debate has centered on the issue of apostasy and salvation. Based on the concept of God's sovereign grace, some hold that, though true believers may stray, they never totally fall away. Others affirm that any who fall away were never really saved. Though they may have "believed" for a while, they never experienced regeneration. Still others argue that the biblical warnings against apostasy are real and that believers maintain the freedom, at least potentially, to reject God's salvation.
[54]
Mormon Concept? Not really, you are mis-informed.
Jehovah's Witnesses: Jehovah's Witness publications define apostasy as the abandonment of the worship and service of God,
Islam: In Islamic literature, apostasy is called irtidād or ridda;
Judaism: The term apostasy is also derived from Greek ἀποστάτης, meaning "political rebel," as applied to rebellion against God,
Christianity: The Christian understanding of apostasy is "a willful falling away from, or rebellion against,
https://en.wikipedia.org/wiki/Apostasyhttps://en.wikipedia.org/wiki/Apostasy
The Great Apostasy occurred when people turned away from the truths of the gospel and the Lord withdrew the authority and keys of the priesthood from the earth.)
Thessalonians 2:3
Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;