John 3:16-18. “For God so loved the world, that He gave His only Son, so that
everyone who believes in Him will not perish, but have eternal life. For God did not send the Son into the world to judge the world, but so that the world might be saved through Him.
The one who believes in Him is not judged; the one who does not believe has been judged already, because he has not believed in the name of the only Son of God."
As I wrote earlier, Jews love God --- but they are not saved.
People can go to church but if they don't believe that Jesus is their Savior, they are not saved.
A person can confess their sins -- but that doesn't save them.
A person can do whatever their denomination tells them, but that doesn't save them.
A person must believe that Jesus is their personal savior, that He died for
their sins. There are many "man-conceived religions" as per the OP, but if they teach salvation by some means other than this they are fruitless.
Titus 3:5-7, "He saved us, not on the basis of deeds which we did in righteousness, but in accordance with His mercy, by the washing of regeneration and renewing by the Holy Spirit, whom He richly poured out upon us through Jesus Christ our Savior, so that being justified by His grace we would be made heirs according to
the hope of eternal life."
Acts 4:11-12, "He [Jesus] is the stone which was rejected by you, the builders,
but which became the chief cornerstone.
And there is salvation in no one else; for there is no other name under heaven that has been given among mankind by which we must be saved.”