According to ancient Turkic beliefs, all the deities are the same. Everybody believes to the same God, even they do not know this.
So, if you believe in AllÃ¢h, you de facto believe Tengri, according to that belief.
According to IslÃ¢m, it is believed that at least one Prophet is sent to each nation. So, there should be a Turkic Prophet too. And of course that Prophet was speaking an ancient Turkic language and in that language God must be Tengri or something similar to that. But the idea that he was calling God "AllÃ¢h" is nonsense.
If a Prophet of AllÃ¢h is calling AllÃ¢h "Tengri", then it should be free to call AllÃ¢h "Tengri".
As a result, AllÃ¢h and Tengri are the same. It is more important to be a good man than the God you believe, according to me. Take Mennonites for example. They are devout Christians but they are very peaceful community. They do not give harm to anybody. And take the terrorist Muslims, for example PKK or Al-Qaaedah. They are Muslim but they are also zealot and kill innocent people.
I am a Muslim but I have more respect and fondness to Mennonites than Al-Qaaedah.
About the answer of the question, I use the word TangrÄ± (Anatolian Turkish for Tengri) instead of AllÃ¢h, except our some idioms and sayings, because it is in my mother tongue, but I have respect to the usage of AllÃ¢h.