I have to disagree strongly with you on this.
In the late 1970s, Ethiopia went Marxist under Soviet and Cuban military “advisers”.
After a dozen or so, they shook this off which led to a religious revival among the Orthodox, Coptic Ethiopian Church and the people. At the same time, their Red Sea state, Eretria, which was Muslim, rebelled.
Eventually, the Eretria’s won their freedom, but have used terrorism against the Ethiopians ever since. Ahmed is finally bringing that to an end.
The country still holds land below the Central Massif (the traditional Coptic Ethiopian highlands) that have a Muslim population, but that is a regional religion. The Muslims are in no way making any headway in the Coptic areas. As far as proselytizing by the sword, that was happening with Eretria, and hence the now (lasting?) peace.
All of this has actually strengthened the Coptic Church. More church growers as a percentage of total population as long as they kept records.
30 Million weekly worshipping Copts out of 104 Million total population: https://www.britannica.com/topic/Ethiopian-Orthodox-Tewahedo-Church
And that’s my point. After the standard bearer of the Lion of Judah was deposed in 1974, the country fell apart, the rest is a tale of turmoil. Peace? Perhaps, but given the area and the volatility of mussulmen, it may not last the month.