Okay, I'm not going to make any personal conclusions about Obama's faith, but I do want to toss this out for additional inputs.
Please only post opinions supported by facts you include. Opinions on their own are unproductive re: religion.
Here goes.
A. Barrack Obama was born of a Muslim father. That makes Barrack Obama a Muslim at birth:
The Shaafa‘i scholar an-Nawawi (may Allah have mercy on him) said: The one whose parents, or one of them, are Muslim is also regarded as a Muslim with regard to rulings concerning the hereafter and worldly matters. End quote from Sharh Muslim, 16/208
B. Obama by either admission or lies, has stated many times he is a Christian.
C. Muslims around the world have not called for Obama to be executed for being an apostate. Apostasy (riddah) means turning away from Islam in word, deed or belief.
And it says in ar-Rawdah: The apostasy of one who has reached the age of discernment counts as such, so he should be asked to repent. If he repents all well and good, otherwise he is to be executed and the rulings on one who has reached puberty also apply to him. In the case of one who has not reached the age of discernment, we should wait until he reaches puberty. If he reaches puberty and is still an apostate, he is to be executed after asking him to repent.
So, based on my own reading of these statements, there are 2 possibilities:
1. Obama is a Muslim, and he is lying about being Christian. The Muslim world approves of lying about one's faith if it serves Islam. or,
2. Obama's birth to a Muslim father and non-Muslim mother in a non-Muslim country (US) have the Muslim world believing, correctly or not, he is non-Muslim, in spite of his father's faith and spending his early years in Muslim Mosques and Muslim schools in a Muslim majority country.
Curious what others might deduce from this and other info you have seen.
https://islamqa.info/en/165492