Firstly there is a difference between accepting the word of a single scientist over accepting the consensus of the scientific community.
Individuals may be dishonest, but systematic dishonesty among so many scientists, with so many differing points of view and all the conflicts and hostilities within the community is not even plausible.
The consensus view may be mistaken on many things but it is still likely closer to the truth than any particular maverick (sometimes mavericks turn out to be right - but more often they are wrong).
So, if you are going to accept an answer on authority then the scientific consensus is one of the safest bets going.
And of couse it is possible to check out some of the evidence - I've seen the Archaeopteryx fossil kept in London and other "dino-birds".
And don't forget that many scientists are religious - Kenneth Miller for instance. If a creationist tries the line that religious bias is a significant factor then he's either ignorant or lying.