Is a one-time pad secure if the encryption method is not? (The following situation is hypothetical.)

I need to communicate something securely and I have decided to use one-time pads.

I am going to be using human genes as the source of the OTP data (this is important).

If I were to use (for example) a weak kind of encryption, in this case a variation of XOR 'encryption', would the fact I am using OTPs offset the weakness of XOR 'encryption' or would it be a complete waste of time because XOR is still inherantly weak?

If it matters, before being XOR 'encrypted' the messages will be plaintext in an unspecified human language (English, Japanese et cetera - the language is irrelevant other than being a known, well spoken human language).

Disclaimer:
I won't be offended if I'm told that this is a horrible idea - It's not my idea.
OTP requires a completely random key. That's next to impossible, and human genes are certainly not completely random. This is why OTP's are mainly theoretical constructs.

XOR is the normal way of encrypting using an OTP. XOR is not weak encryption if the key stream is strong. And if the key stream is perfectly secure then XOR encryption is completely secure (for confidentiality anyway).

And no, the messages do not matter. A secure cipher should be secure against known plaintext attacks. That is, different messages or other parts of the message should remain confidential even if part of the message is known.

It's good that you're not offended, because it certainly is a horrible idea.