That's very easy, when a Muslim says this "God is One", that's grooming. They will tell you next that Islam is less a distorted worship of God, and Mohammed is the very last prophet of God, while Muslim prophet Isa (aka Jesus) was cool but outdated. They will gladly explain you that the Bible is a wrong book, but, if you criticize the Quran, they will become angry and intimidate you.
They tried to sweetly convert me when I was staying at their hotels, visited their shops, and the formula is simple: "if you believe in God, you are Muslim" - then they smile condescendingly. When you are saying, "wait, the Bahai Faith is the last and most modern "God is One" religion", they frown - Bahais are ones to kill, not to follow.
Baháʼu'lláh - means Glory of God. This is the last prophet of real God - less distorted than Mohammed, and the holy book Kitab-i-Aqdas is actually holy, unlike the Quran. I really recommend following Bahaism if you are a true believer, or you will burn in hell.
Modern Christians and Christian atheists considered to be weaklings who allow anybody to humiliate their heritage and culture. It's considered part of the Christian world decay alongside with the low fertility, widespread homosexuality, etc.
That's a very simple thing. Nobody refuses that there is Russia and there are some % of Russians who want to see their country as an empire controlling other countries. Just the same about Islam: it's a decentralized Arab Caliphate, with the ideological center in the homeland of Islam - the Arabian Peninsula. They spread this imperialist ideology in other Muslim nations, teach them to despise decaying Chirtians, teach them to be traitors of their countries (first you are Muslim, and only then you are Indian); they incite hatred towards compatriots and erase local traditions, etc.
This imperialism is as real as the Russian one. It doesn't make Russia bad or Islam bad - once Germany wanted to be the master too and Britain wanted all the world, right, but it's a dangerous sickness that needs treatment. Moreover, there are Muslim countries fighting against the same plague - the Stans. Hopefully, Iran will join them one day, as Iran and the Stans are related cultures.
And no, not each religion is the same. The only religion that acts as an empire nowadays is Islam.
RE: “God is One: Allah for Muslims, God for Christians” on an Electoral Poster in Agrigento: Religious Messaging and the Question of Secularism in Italian Local Politics