Phil, you hit one of the nails here, on the head, with your comment. When we listen to the theories of astrophysicists, and evolutionists, it makes many people uncertain about God. This happened to me also, some 40 years ago. And even though I’m only a layman in science and philosophy, I’ve been searching for an answer some 30 years. God finally gave me answers after years of asking. But how can I explain to others what God revealed to my soul. I’m not sure I can. And even if I told you a few things, you wouldn’t believe it. (most likely)
To start, you need faith in God to believe it, and not ordinary faith, but the kind of faith the Holy Spirit gives. I can’t give that to anyone else, but the Holy Spirit can. So pray to God for the faith that the Holy Spirit can give you. Also read the Bible and believe it even if you think it doesn’t make sense. Consider this. Black holes, alternate realities, and parallel universes don’t make sense, or can’t be proven, but millions of people believe it anyway. That’s faith, but in the wrong things. Apply that kind of belief to the Bible. Assume it’s true, and let God make it real to you. We have more reason to believe God and the Bible are true, than we do to believe in alternate realities.
One reason I like Catholicism better than any Protestant church is because Catholicism freely admits there are mysteries in our faith and we’ll never know the answers while we live on Earth. There are likewise mysteries in the universe we’ll never know the answers to neither. God loves the humble but opposes the proud. A humble and contrite spirit God will never turn away. But to the boastful arrogant man, God will send a him a strong delusion so that having ears, he won’t hear, and having eyes he won’t see, because if he did he may turn and God would have to accept him. God doesn’t do things like that.
Pray to God for answers, and think of Him day and night if you can. If you’re sincere and earnest, He will hear you and answer you.