First off, Baptist is a denomination of Christianity, like Pentecostal, Trinity of God, Methodist, etc.
(I myself am non-denominational, we don't put a name for ourselfs, we follow what the Bible teaches, and believe the only way to heaven is Salvation) This link explains what salvation is.
http://www.creationtips.com/saved.htmlTaken from a google search I found this is the difference between Christianity and Catholic: (Below is a copy/paste I found correct but didn't write any part of:)
"Let me try and answer this in a way that casts no bias in either direction. I'm not here to bash either points of view - just to try and answer your question.
First thing to understand is that there are three main classes of Catholic:
(traditional) Catholic
Roman Catholic
Christian Catholic.
...oh, and then there are those who identify themselves as Catholic because they were brought up in that environment rather than due to any beliefs/practises they may hold.
Confused yet?? Well keep reading

Roman Catholics tend to hold the most importance in all the traditional rituals - ie, importance of the saints, rosary beads, confessionals, etc. The Roman Catholic is less likely to read the bible themselves, relying more upon the hierarchy of the church to guide their religious direction.
Regular Catholics, whilst not tending to be as imbued in the ritualism of the Church, still hold to many of the traditional beliefs. The confessional is still deemed important in seeking forgiveness for sins.
Then there is the Christian Catholic (represented by such as John Paul II, John XXIII, and from memory the current pope) who tend to give the many Catholic symbolism far less weight, in preference to having a personal relationship with their God. These Catholics are often guided to bring unity btwn the Christian and Catholic brethren.
Now that you're probably confused as all heck, I'll try and cover a couple of the key differences.
The Catholic Church tends to be far more hierarchical in nature - the closest Christian comparison is the High Anglican, which was in many ways modelled off the Catholic Church by Henry VIII after being blacklisted because of divorce.
This actually stands as another key difference. Whilst both belief systems hold to the sanctity of marriage, the traditional and Roman branches of the Catholic church do not support divorce at all - although in specially circumstances a marriage can be annulled (I can't remember the exact terminology), such as in cases where there is ongoing spousal abuse or if one party has abandoned the church completely (the other party can then apply for this).
The other key difference (and most would agree this stands as the most significant of all) lies in their relationship with God. The Christian & the Christian Catholic alike believe in a personal relationship with their saviour, with need for an intermediary. Their sins are forgiven through the blood of Jesus. A cornerstone of faith is the understanding that "no man shall come to the Father but through Jesus the Son".
Catholics and Roman Catholics instead will seek intermediaries such as Mary or the saints, who are seen as a bridge btwn them selves and Christ. Sins are forgiven through confession and penance rather than through praying directly to Jesus/God.
Christians alike also see the concept of being "born again" central to their faith, acknowledging that all are born in sin and thus must come to God on their own. From memory this is not the case with Catholicism (although a catholic could best explain why that is..a I can't for the life of me remember).
Anyhow, I hope this helps in some way. As I said at the beginning, there are a raft of differences - too many to cover here - but these are some of the most significant."