Yes, it is possible to argue for a deeply held belief about god without committing the fallacy of subjectivism as long as objective reasons are given to support the belief.
In order to prove your point, you always need to have an objective reason. When a point is made on religion or a belief about God, one needs to relate his point with an objective reason.
If an objective reason is not given to prove your point, te this can lead to the fallacy of subjectivism. Anything that is not backed up by reasons will not be convincing enough and people will say that there are no moral truths out there.
Hence, if you want to express a belief about God, then you need to do it using objective reasoning.
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