Whilst it is true that Christianity involves certain religious practices, religion itself is powerless to save anybody. Lots of people are religious, and lots of people are spiritual, but that does not necessarily mean that God is pleased with them, or that their religion is acceptable to God.
This is discussed in Romans 1:18-32. Paul is making a clear distinction between Christianity and the various religions that flourished during the first century.
"The wrath of God is being revealed from heaven against all the godlessness and wickedness of men who suppress the truth by their wickedness..." "For although they knew God, they neither glorified him as God nor gave thanks to him, but their thinking became futile and their foolish hearts were darkened. Although they claimed to be wise, they became fools and exchanged the glory of the immortal God for images..." "They exchanged the truth of God for a lie" and "they did not retain the knowledge of God."
"Idolatry is the worship of something that, in fact, is not God. The worship of idols involves the practice of religion. This is exactly what Romans 1 is speaking about; God is not pleased by any and all types of religious activity. Our religious activity may at times be insulting to God. Christianity itself can degenerate into being merely a religion; that is, it can have the external formal activities and sociological practices without the substance that motivates all these things—a profound love and devotion to God himself and a profound trust in Christ's work."
The difference between Christianity and religion is that the former is a way of life - a life that is devoted to doing the will of God. Lip service and outward symbols of devotion don't count. A believer has to be born again, or born from above, and the evidence of such a transformed life is that the believer produces the fruit of God's Spirit.
Religion might make a person feel good, and a person might sincerely believe they are practicing the one and only "true" religion. But if that religion does not glorify God and does not give thanks to God, the immortal Creator, then that religion is worthless.
Religion does not save. Only Christ Jesus saves.