Without taking side to anyone, it is very common within buddhist community that:
1. Think Buddha as a God.
2. The life is created by God.
3. There is no past life.
We cannot avoid this. We may ask around, and these people are there. This is reality of life.
Only those who study buddhism can know that Buddha is not God, and the life is without beginning.
We have a moral responsibility to explain the correct Buddism at the speed of that person understanding. Soon or later, that person will understand if that person also have enough merit to understand. If that person cannot, at least in his imprint, he may understand it in the future.
In the beginning of learning Buddhism, the existance of God doesn't really affect the learning process of that person. The non-existance of God can only be proven logically when that person understand sunyata. Since, this sunyata is even unheard, it is better not to discuss the existance of God with that basis.
The existance of past life is also not necessary to be understood in the beginning of the learning process. Although when study the law of karma will have a bit problem, when the confident of law of karma improves, slowly but sure, that person will ask him/herself about the existance of past life.
Everything takes process. That is why we are here, and we will forever here to show the reality of life until the end of this samsara. This is the call of our metta.