I don't.
I can see no evidence at all (IMO) for the existence of god - only a lot of hearsay. (Along with a great deal of imagination/speculation/wishful thinking/brain washing.)
All religions can't all right, as they often contradict each other and therefore most of them must be slightly or all wrong. (So why not ALL of them are 100% wrong, would makes more sense to me.)
I was brought up nominally Christian. But once I left home and really had a think about the topic of religion(s) properly (at uni), I soon came to the conclusion that it's obviously all made up (folklore) nonsense which ppl have used/exploited to gain control over societies and make them conform to certain (desired) patterns of behaviour/guidelines. (Before that I had sort of gone along with it all thinking it was generally quite nice and completely harmless.)
Nb I studied a biology subject at uni which was amazingly interesting. But nothing I learnt ever convinced me to think there must be a god, as there are so many redundancies, mistakes and cruelties found in nature that the god who was in charge would have to be quite a rubbish designer and/or learning as he went and on the job (rather than infallible) and not very nice either.
For me now, believing in god is like believing in a combination of the tooth fairy, a lucky charm and the bogeyman ie a bit of fun/a hope for a reward if we are good (or for something nice to happen) and having a deep fear which keeps us in line/on track. (Our mums used to tell us kids that the bogey man would get us if we stayed out playing after dark ... to scare us into coming home on time, thinking it would keep us safe!)
I used to quite envy people their faith when I was younger, (never quite being able to believe myself) but as I have got older I am a lot less accepting of it, or of any other religion, as I have come to see all the problems religious belief systems can cause. (Especially the ones which whose rules are fixed and cannot be easily challenged/adapted.) So do not find being religious helpful to a society.
Apart from starting conflicts and aiding division/persecution, religions can also hold back scientific progress and new knowledge by saying we should not "play god"/go against certain religious teachings etc. So it can encourage ignorance/fear ... and prevent positive changes.
I think we are all susceptible to feelings of fear/insecurity and also fairly open to persuasion. So I can sort of understand the appeal of believing in a god one can turn to/ask for help in hard times . (That's the positive side of a religion - thinking someone powerful is on our side?) But for me, my reasoning just doesn't allow me think that a personal god is possible ... or even a good thing to exist. So I can draw no comfort there. In fact I consider faith in a personal god to be a weakness/cop out from reality now.
The idea of a creator (ie a higher power but not a personal god) who 'made' everything but who is indifferent to us (ie a god who doesn't exist to think or care about whether we are good/pray to him or her/wear certain clothing etc) is slightly easier to accept. But I still don't even buy that. (Prefer to just stick to the laws of physics etc.)
No-one understands why things are the way they are and it just blows my mind to think about the universe and how we got here. But believing in "a god" doesn't explain anything to me either. (Cos gravity could be classed as a higher power? But how does believing in gravity help explain why we are here?)