Yet the Bible says "seek and ye shall find." Even as the resurrected Jesus was about to leave his eleven disicples, some of them still doubted (cf Mat 28:17)
In humility to Him, we are able to seek and He is free to grace us with faith.
The problem with the person seeking proof of His existence is that creature is qualified to judge the Creator. We aren’t able to recognize that proof even when it is openly laid before us as it is daily.