Because they don’t hold the faith entrusted to the apostles by Jesus Christ.
Russia isn’t very tolerant of Catholicism either.
Actually, it is distinctive Catholic teachings that are not manifest in the only wholly God-inspired, substantive, authoritative record of what the NT church believed (which is Scripture, in particular Acts through Revelation, which best shows how the NT church understood the gospels)
What the Bible teaches is that the redeemed are those who have been spiritually born of the Spirit (Jn. 3:2-7) by effectual, penitent, heart-purifying, regenerating faith (Acts 10:43-47; Acts 15:7-9) in the Divine Son of God sent be the Father to be the Savior of the world, (1 Jn. 4:14) who saves sinners by His sinless shed blood, on His account , rendering them "accepted in the Beloved" (Eph. 1:6; Eph. 2:6-9) - not deserved by any merit of themselves or any church.
For this faith is imputed for righteousness, (Romans 4:5) rendering one to be considered positionally righteousness, “justified” in God’s sight, and (as a result) this is shown in baptism and following the Lord, (Acts 2:38-47; Jn. 10:27, 28) whom they shall go to be with at death or His return (Phil 1:23; 2Cor. 5:8 [“we”]; Heb. 12:22, 23; 1Cor. 15:51ff'; 1Thess. 4:17) Glory and thanks be to God.
In contrast to those who were never born of the Spirit or who terminally fall away. (Gal. 5:1-4; Heb. 3:12; Heb. 10:25-39)
In contrast, Catholicism believes the act of baptism itself effects regeneration, by which change one is justified, thus resulting in salvation by actually becoming good enough (via the act itself of baptism, and then via sacramentally aided attainment and - for most, Purgatory) to ultimately actually be with/see God in Heaven.retu