Ah! It sounded like part of your objection to Islam was your evaluation that Islam was shallow and uninteresting, therefore it could not possibly be true. I apologize for misunderstanding your views.
Well that wording there changed things- yes part of my
objection to Islam is evaluation of its philosophy, consistency, and applied ethics. Truth is another, only partially related matter. The main thing is I don't think it's true of course, and nearly as importantly, I think it's good that it's not true. The ethical problems of a religion only directly matter for determining its truth or not when the religion makes ethical conclusions based on facts that are later shown to be inaccurate. Usually truth determination is a fairly separate matter.
I generally don't bother debating Muslims on whether Islam is true, nor do I spend much time debating conservative Christians about whether their religion is true. On occasions where I've tried, I've found that often their views are so far removed from the scientific understanding of the history of this planet and universe and how it works, that we can't discuss truth because we're not even working with the same set of facts. I don't really assign Allah any more probability of being true than say, Jupiter or Ra, so it's just not an interesting point to me. I prefer to spend time on truth debates with other people on other topics.
Applied ethics, on the other hand, are very interesting to me. Because if a religion is entirely untrue in the sense that none of its gods exist and its metaphysical claims are completely inaccurate, it's still true that the religion exists on this planet and people believe it. There's a book from about 1400 years ago that 1.5 billion people believe is the word-for-word infallible recitation from the creator of the universe, and that it's something to base one's own life and one's laws around. So, it's true that Islam is the second largest religion on the planet, primarily centered around the Middle East, North Africa, and South Asia with smaller populations in most countries of the world.
And it's true that in terms of rankings for things like human rights, gender equality, the freedom of religion and expression, or the freedom of LGBT people, Islamic-majority countries tend to get internationally ranked near the bottom of all of those lists. In some Islamic countries women can't vote or drive, and the majority of countries that have laws against consensual adult homosexual sex (up to and including prison or death in many cases) are Islamic countries. Today, most predominantly Christian and Jewish countries strongly support freedom of speech, religion, and expression, even though that was not the case in the past. Many Hindus, Shintos, pagans, non-religious folk, and Buddhists, also strongly support freedom of speech, religion, and expression, although there are of course exceptions like in parts of sub-Saharan Africa, North Korea, aspects of China, etc. Islamic countries on the other hand with a few exceptions tend to fairly consistently restrict freedom of speech, religion, or expression, and especially when concerning criticism of Islam.