1. While years ago Catholics attended Mass much more than Protestants attended Sunday worship, today the percentages are about the same - roughly 25%-30%. Many Protestants think they are doing well to attend, say, once or twice a month.
2. From the time of the Reformation, Protestants were skeptical of the importance of what they called 'good works', that is, they deemphasized the Catholic emphasis on the idea that if you prayed certain prayers, etc., you 'got points' (indulgences). Luther's outrage, of course, came from the fact that Tetzel, raising money to build St. Peter's, said that giving money to that purpose would get relatives out of purgatory faster, cut down on one's own stay in purgatory, etc.
3. Catholics traditionally held their clergy in higher esteem than Protestants. Understandable in light of the idea that priests can absolve people of sin as well as recite a prayer that bings about transubstantiation re the Eucharist. So Protestants were less likely to do what the pastor asks them to do, e. g., attend worship faithfully. Ministers, of course, urge regular church attendance. Many Protestant parishes actually elect their pastors - e. g., Baptists and UCC.
4. In many communities today Protestants attend church as frequently as Catholics, and even more frequently. There is a strong attachment to specific congregations among millions of Protestants, in part because of an extended family atmosphere. People anticipate seeing other people on Sunday, chatting during coffee hour, etc.
5. There has developed over the past 50 years widespread skepticism among Catholics. Why? It is difficult for many modern minds to accept such basic doctrines as transubstantiation and the Immaculate Conception. They may view such doctrines as relics from medieval times that seem out of place in the present century. The decline in Catholic schools has played a role. So has the women's movement and the sexual revolution, which have impacted the entire society, all faiths. The percentage of people who say they have no religion or no church connection has risen considerably. I hear it said that there are 30,000,000 former Catholics in the USA. The continual condemnation of all artificial birth control by the Papacy has caused many Catholics to fall into the habit of disregarding church authority in other matters as well. I often have wondered how many of these ex-Catholics fell away from all religion and how many went into a different religion, Protestant or other.
6. The sex scandal within Catholicism has had a major effect on many Catholics. Protestant clergy certainly have not escaped. Consider Jim Bakker, Jimmy Swaggart, Ted Haggard, Richard Roberts and other evangelicals involved in scandals, some of them involving sex. The mainline Protestant denominations also have been plagued by divisive issues, most especially what attitude to take toward gays and lesbians. The Episcopalians, UCC, some Presbyterians and some others will ordain them. The two largest Protestant groups, Methodists and Baptists, will not, unless homosexuals are celibate. Tough issue. One that has plagued Catholicism where most of the sex crimes seem to have involved priests preying on teenage boys.
7. As a person with a mixed Catholic/Protestant heritage myself, I find there is enormous division within Protestantism, with all sorts of opinions, though the mainline denominations seem to be very friendly and cooperative with one another. No authority. On the other hand, my beef with Catholicism is that it is more authorative than my rebellious streak easily accepts.
God bless Catholics, Protestants, Orthodox, Jews, Muslims, Hindus, Buddhists - and we could go on. God bless the whole world with peace and understanding and reconciliation and mutual respect - people of every creed, color and country. May religion become a bridge and not a barrier.