Christianity is only monotheistic in name, for "reasons." The Trinity would just be three separate gods in any other religion. Even classifying Father, Son and Holy Spirit as "separate divine aspects of a single God" is basically what Hinduism does, and no one argues that Hinduism is monotheistic that I'm aware of. Also, the way saints and angels have traditionally been regarded in Christian practice (particularly in antiquity, prior to Protestantism) is exactly the way other religions have regarded minor and household gods, or ancestor gods.

Which, in fairness, is a reason many denominations reject the notion of saints.

I don't think adherence to a rigorous definition of "monotheism" is really necessarily a premise of Christian belief. Every mainstream Christian denomination has thought more carefully about this definitional issue than any of us here have. If it's important to you, there's a menu of mainline denominations to select from to calibrate your "monotheism" to your church's.

The LDS church is broadly considered by Christian denominations not to be Christian, because it (like the JW's, also in the same bucket) doesn't accept the Trinity doctrine. My point being, just, the LDS church is already not operating from the same premise you are about what "Christianity" means.