I seem to recall a different scenario when Cain and Abel each offered sacrifices but God only accepted the one that did right.
It seems like you are making the error of Cain by assuming all sacrifices or all forms of worship, even those that assert falsehoods about the only begotten Son, are acceptable to God.
>And Samuel said, Hath the LORD as great delight in burnt offerings and sacrifices, as in obeying the voice of the LORD? Behold, to obey is better than sacrifice, and to hearken than the fat of rams.
- 1 Samuel 15:22
>Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? >And what concord hath Christ with Belial? or what part hath he that believeth with an infidel?
>And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people.
>Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you,
- 2 Corinthians 6:14-17
This isn't the teaching of popular syncretists of this world, this isn't saying just follow your own views however right or wrong they may be. God has set standards for us and those that are saved will want to meet those instead of joining an organization that fails to do so. People that are doing the ordinances wrong, like it says in Hebrews chapter 6, "crucify to themselves the Son of God afresh, and put him to an open shame."
There is one truth, the Biblical truth. There is only one truth. People that alter or deviate from that are essentially like Cain, wanting to do things their own way. There is no way they will ever be accepted until they truly turn from their wicked ways. They still have to repent and begin to accept all of God's word and the teachings given in it, and do it before it is too late. This is the truth contained in the word of God. All you have is a choice of whether to accept that truth or continue to deny and be righteously judged for that wicked choice, which is totally on you for not accepting it.