Your question is loaded with at least one false assumption. Every human does not have a reason to believe in a deity. Are these meant to be real questions, or at they just thinly disguised preaching? I am leaning towards the latter.
Real questions.
for example, some of the reasons why people follow a religion are listed below
1. Following cultural norms and practices ( some people don't wish to stick out)
2. following the religion of their forefathers (ancestral attachment) similar to cultural
3. financial benefits ( Governments and NGOs) normally pay a large amount to ignorant citizens so they can change demographics
4. cultural and racial biases to other faiths and peoples, so some stick with religions which seems culturally similar to themselves
5. Media
6. lack of mental faculty to read and research
etc,
so what evidence would you need to believe in Allah and becoming a Muslim?