All worldviews make truth claims.
The assertion that there is a God is a truth claim, but it's important to remember that all worldviews - whether they are religious or non-religious - are making truth claims. Interestingly, because of the inherent difficulty in proving a negative, it's actually more difficult to make a case for God’s non-existence than for his existence.
In weighing the available evidence, including evidence from science, we believe the assertion ‘God exists’ to be the most rational truth claim.