If you read the entire article you will note the article says this about the Immaculate Conception....No direct or categorical and stringent proof of the dogma can be brought forward from Scripture.
Over time and through the Holy Spirit, doctrine has developed. It has been a slow process and one full of deliberation and debate. That doesn't invalidate the Church nor the body of theology. It actually enhances it because all sides of issues have been contemplated for millennia. You think you are the first ones to seek answers?
The Mormons and others have made the same claim that doctrine continues to develop.
There is currently a movement among some Roman Catholics to proclaim another Marian dogma. However, the RCC is not yet ready to proclaim it....yet. But it will happen given enough popular support and time. http://www.fifthmariandogma.com/
Please post for me the Lord's Prayer with the Scripture citation for all that you pray each time...