MIAMI — In a year in which most states have steered clear of contentious ballot initiatives, Florida voters are facing two proposed constitutional amendments — one on abortion, the other on the separation of church and state — that could have far-reaching repercussions.

Drafted by the Florida Legislature, along with nine other proposed amendments that will appear on the ballot in November, the first measure would restrict abortions and the second would allow public money to flow to religious institutions — an effort, opponents say, to revive school vouchers. The initiatives would require the approval of 60 percent of voters to take effect.

Both issues have galvanized supporters and opponents, including the Roman Catholic Church, reproductive rights groups, religious conservatives and the state teachers’ union, all of which are plunging money and volunteers into an effort to reach weary, long-badgered voters in this swing state.

Critics and backers of the amendments said they were concerned that voters, who will face long ballots printed in multiple languages and laden with various candidates and issues, may be unprepared to fully understand the consequences of the measures. In Miami-Dade County, for example, the ballot is 12 pages long, and some voters are likely to misunderstand the breadth of the amendments or run out of patience or time to make selections all the way down the ballot, policy analysts say.