Welcome to the forum carpentaro.
I also come from a catholic family, however unlike you I came to the conclusion that christianity in it's entirety is false. I'm interested in your statement that christianity adapts and progresses. While I wouldn't say there has been no adapting with the times I would say this isn't down to the religion, but rather the religion having no choice. It's evolve or die and christianity often drags behind. If you're lucky enough to live in the western world, partially western Europe, you have the luxury of picking and choosing your religion. This is because society fought and struggled for centuries, and christianity was dragged kicking and screaming into the enlightenment. I'm actually of the opinion one of the reasons there is such a clusterfuck in the west in regards to islam is that islam has not gone through the same process as christianity, but like christianity islam will also adapt or die.
In regards to your comment on the sins of the churches being ancient history, I have to disagree. The crimes and suffering heaped on the faithful is alive and well to this day.
The following is a verse from a hymn written in 1892 for use in the church of England to call upon god to convert the jews to christianity.
Though the Blood betrayed and spilt,
On the race entailed a doom,
Let its virtue cleanse the guilt,
Melt the hardness, chase the gloom;
Lift the veil from off their heart,
Make them Israelites indeed,
Meet once more for lot and part
With Thy household's genuine seed
Hitler has ripe pickings for his attempt to wipe out the jews in no small part because of christianity. For centuries christianity had accused the jews of deicide, literally the murder of god. Up until the 19th, possibly 20th century, jews would be accused of blasphemy of some sort or another, usually breaking into churches in the dark of night and desecrating sacred wine or crackers, and as a result entire villages would be wiped out.
In the late 19th and early 20th centuries the church adhered to a distinction between "good anti-semitism" and "bad anti-semitism". The "bad" kind promoted hatred of jews because of their descent. This was considered un-christian because the christian message was intended for all of humanity regardless of ethnicity; anyone could become a christian. The "good" kind criticized alleged jewish conspiracies to control newspapers, banks, and other institutions, to care only about accumulation of wealth, etc. Many bishops wrote articles criticizing jews on such grounds, and, when accused of promoting hatred of Jews, would remind people that they condemned the "bad" kind of anti-semitism
After the world was horrified by treatment of the jews in the second world war, it still wasn't until the second Vatican council in the 1960s that the church issued a declaration which repudiated the belief in the collective jewish guilt for the crucifixion of Jesus.
Moving on from that into the later part of the 20th century to today, we find that christianity is desperate to interfere in other parts of peoples lives. AIDs is god's judgement on the sodomites. Women's health services are under attack. Our governments and our schools and our children's education is under threat. The psychological damage that is being done with christian dogma, the most evil being the concept of original sin being taught as truth. And this is just in the west. Who can forget how the Africans were told that AIDs is bad, but not as bad as condoms. Or the survivors of the Haiti tragedy being told it was their fault, that god had judged them for their sin. Even now, today. laws are being pushed for in some countries to persecute people who don't conform to the standards of particular christian fanatics convinced they have god on their side.
I accept that most christians are decent people, and in no way am I saying that any of the above describes you, but saying all sins are in the past, simply ancient history, is not true and needs to be faced.
Topic: Introduction carpentaro